diff --git a/README.txt b/README.txt
index 3dfc4e8..090f7b5 100644
--- a/README.txt
+++ b/README.txt
@@ -1,4 +1,4 @@
-riverdev 0.5.6 by paramat
+riverdev 0.5.7 by paramat
 For latest stable Minetest back to 0.4.8
 Depends default
 Licenses: code WTFPL
diff --git a/functions.lua b/functions.lua
index 4f7ad21..7d35aef 100644
--- a/functions.lua
+++ b/functions.lua
@@ -89,61 +89,64 @@ function riverdev_snowypine(x, y, z, area, data)
 	local c_snowblock = minetest.get_content_id("default:snowblock")
 	for j = -4, 14 do
 		if j == 3 or j == 6 or j == 9 or j == 12 then
-			for i = -2, 2 do
 			for k = -2, 2 do
-				if math.abs(i) == 2 or math.abs(k) == 2 then
-					if math.random(7) ~= 2 then
-						local vil = area:index(x + i, y + j, z + k)
-						data[vil] = c_needles
-						local vila = area:index(x + i, y + j + 1, z + k)
-						data[vila] = c_snowblock
+				local vi = area:index(x - 2, y + j, z + k)
+				local via = area:index(x - 2, y + j + 1, z + k)
+				for i = -2, 2 do
+					if math.abs(i) == 1 and math.abs(k) == 1 then
+						data[vi] = c_pinetree
+					elseif math.abs(i) + math.abs(k) == 2
+					or math.abs(i) + math.abs(k) == 3 then
+						data[vi] = c_needles
+						data[via] = c_snowblock
 					end
+					vi = vi + 1
+					via = via + 1
 				end
 			end
-			end
-		elseif j == 4 or j == 7 or j == 10 then
-			for i = -1, 1 do
+		elseif j == 4 or j == 7 or j == 10 or j == 13 then
 			for k = -1, 1 do
-				if not (i == 0 and j == 0) then
-					if math.random(11) ~= 2 then
-						local vil = area:index(x + i, y + j, z + k)
-						data[vil] = c_needles
-						local vila = area:index(x + i, y + j + 1, z + k)
-						data[vila] = c_snowblock
+				local vi = area:index(x - 1, y + j, z + k)
+				local via = area:index(x - 1, y + j + 1, z + k)
+				for i = -1, 1 do
+					if not (i == 0 and j == 0) then
+						data[vi] = c_needles
+						data[via] = c_snowblock
 					end
+					vi = vi + 1
+					via = via + 1
 				end
 			end
-			end
-		elseif j == 13 then
-			for i = -1, 1 do
+		elseif j == 14 then
 			for k = -1, 1 do
-				if not (i == 0 and j == 0) then
-					local vil = area:index(x + i, y + j, z + k)
-					data[vil] = c_needles
-					local vila = area:index(x + i, y + j + 1, z + k)
-					data[vila] = c_needles
-					local vilaa = area:index(x + i, y + j + 2, z + k)
-					data[vilaa] = c_snowblock
+				local vi = area:index(x - 1, y + j, z + k)
+				local via = area:index(x - 1, y + j + 1, z + k)
+				for i = -1, 1 do
+					if math.abs(i) + math.abs(k) == 1 then
+						data[vi] = c_needles
+						data[via] = c_snowblock
+					end
+					vi = vi + 1
+					via = via + 1
 				end
 			end
-			end
 		end
-		local vit = area:index(x, y + j, z)
-		data[vit] = c_pinetree
+		local vi = area:index(x, y + j, z)
+		data[vi] = c_pinetree
 	end
-	local vil = area:index(x, y + 15, z)
-	local vila = area:index(x, y + 16, z)
-	local vilaa = area:index(x, y + 17, z)
-	data[vil] = c_needles
-	data[vila] = c_needles
-	data[vilaa] = c_snowblock
+	local vi = area:index(x, y + 15, z)
+	local via = area:index(x, y + 16, z)
+	local viaa = area:index(x, y + 17, z)
+	data[vi] = c_needles
+	data[via] = c_needles
+	data[viaa] = c_snowblock
 end
 
 function riverdev_jungletree(x, y, z, area, data, y1)
 	local c_juntree = minetest.get_content_id("default:jungletree")
 	local c_junleaf = minetest.get_content_id("riverdev:jungleleaf")
 	local c_vine = minetest.get_content_id("riverdev:vine")
-	local top = math.min(math.random(17,23), y1 +16 - y) -- avoid chopped trees
+	local top = math.random(13, math.min(y1 + 16 - y, 23)) -- avoid chopped trees
 	local branch = math.floor(top * 0.6)
 	for j = -5, top do
 		if j == top or j == top - 1 or j == branch + 1 or j == branch + 2 then
@@ -182,35 +185,70 @@ function riverdev_jungletree(x, y, z, area, data, y1)
 	end
 end
 
-function riverdev_boulder(x, y, z, area, data)
-	local np_boulder = {
-		offset = 0,
-		scale = 1,
-		spread = {x=16, y=16, z=16},
-		seed = 5933,
-		octaves = 2,
-		persist = 0.67
-	}
-	local chulens = {x=17, y=17, z=17}
-	local minpos = {x=x-8, y=y-8, z=z-8}
-	local nvals_boulder = minetest.get_perlin_map(np_boulder, chulens):get3dMap_flat(minpos)
-	local c_boulder
-	if math.random() < 0.2 then
-		c_boulder = minetest.get_content_id("default:sandstone")
-	else
-		c_boulder = minetest.get_content_id("riverdev:stone")
+function riverdev_acaciatree(x, y, z, area, data)
+	local c_actree = minetest.get_content_id("riverdev:acaciatree")
+	local c_acleaf = minetest.get_content_id("riverdev:acacialeaf")
+	local top = 4 + math.random(3)
+	for j = -3, top do
+		if j == top then
+			for i = -4, 4 do
+			for k = -4, 4 do
+				if not (i == 0 or k == 0) then
+					if math.random(7) ~= 2 then
+						local vi = area:index(x + i, y + j, z + k)
+						data[vi] = c_acleaf
+					end
+				end
+			end
+			end
+		elseif j == top - 1 then
+			for i = -2, 2, 4 do
+			for k = -2, 2, 4 do
+				local vi = area:index(x + i, y + j, z + k)
+				data[vi] = c_actree
+			end
+			end
+		elseif j == top - 2 then
+			for i = -1, 1 do
+			for k = -1, 1 do
+				if math.abs(i) + math.abs(k) == 2 then
+					local vi = area:index(x + i, y + j, z + k)
+					data[vi] = c_actree
+				end
+			end
+			end
+		else
+			local vi = area:index(x, y + j, z)
+			data[vi] = c_actree
+		end
 	end
-	local avrad = 2 + math.random() * 3
-	local ni = 1
+end
+
+function riverdev_cactus(x, y, z, area, data)
+	local c_cactus = minetest.get_content_id("riverdev:cactus")
+	for j = -2, 4 do
+	for i = -2, 2 do
+		if i == 0 or j == 2 or (j == 3 and math.abs(i) == 2) then
+			local vic = area:index(x + i, y + j, z)
+			data[vic] = c_cactus
+		end
+	end
+	end
+end
+
+function riverdev_boulder(x, y, z, area, data)
+	local c_stone = minetest.get_content_id("riverdev:stone")
+	local dx = math.random() * 15 + 1
+	local dy = math.random() * 15 + 1
+	local dz = math.random() * 15 + 1
 	for k = -8, 8 do
 	for j = -8, 8 do
 		local vi = area:index(x-8, y+j, z+k)
 		for i = -8, 8 do
-			if (i ^ 2 + j ^ 2 + k ^ 2) ^ 0.5 < avrad * (1 + nvals_boulder[ni] * 0.7) then
-				data[vi] = c_boulder
+			if (i ^ 2 * dx + j ^ 2 * dy + k ^ 2 * dz) ^ 0.5 < 8 then
+				data[vi] = c_stone
 			end
 			vi = vi + 1
-			ni = ni + 1
 		end
 	end
 	end
@@ -316,6 +354,29 @@ minetest.register_abm({
 	end,
 })
 
+-- Acacia sapling
+
+minetest.register_abm({
+	nodenames = {"riverdev:acacialing"},
+	interval = 61,
+	chance = 3,
+	action = function(pos, node)
+		local x = pos.x
+		local y = pos.y
+		local z = pos.z
+		local vm = minetest.get_voxel_manip()
+		local pos1 = {x=x-4, y=y-3, z=z-4}
+		local pos2 = {x=x+4, y=y+7, z=z+4}
+		local emin, emax = vm:read_from_map(pos1, pos2)
+		local area = VoxelArea:new({MinEdge=emin, MaxEdge=emax})
+		local data = vm:get_data()
+		riverdev_acaciatree(x, y, z, area, data)
+		vm:set_data(data)
+		vm:write_to_map()
+		vm:update_map()
+	end,
+})
+
 -- Set mapgen parameters
 
 minetest.register_on_mapgen_init(function(mgparams)
diff --git a/init.lua b/init.lua
index 0108a94..b21f568 100644
--- a/init.lua
+++ b/init.lua
@@ -1,22 +1,20 @@
--- riverdev 0.5.6 by paramat
+-- riverdev 0.5.7 by paramat
 -- For latest stable Minetest and back to 0.4.8
 -- Depends default
 -- License: code WTFPL
 
--- remove tunnel expansion
--- add caves using 5 noises
--- jungletrees auto-limit height to avoid chop
--- add fissures
--- 3d noise boulders, some sandstone
+-- return to simple boulders
+-- compressed snow on paths in taiga
+-- update snowypines
+-- add humidity noise from water distance
+-- re-add long grasses noise
+-- vary acaciatree height
+-- add biomes
 -- TODO
 -- regeneration command: use of mapgen loop function
--- update snowypines
 -- coloured stone: desertstone orange sandstone green blue violet
 -- inclined strata with 3d biomes of coloured stone mixes
 -- ores in strata
--- add humidity from water distance
--- add all watershed biomes
--- gravel in tunnels/caves
 
 -- Parameters
 
@@ -24,7 +22,7 @@ local YMIN = -33000 -- Y limits of realm generation
 local YMAX = 1024
 local YWATER = 1 -- Water surface y
 local YSAND = 4 -- Top of beach y
-local YTER = -92 -- Deepest seabed y
+local YTER = -64 -- Deepest seabed y
 local YPINE = 47 -- Pines above this y
 
 local TERSCA = 512 -- Terrain vertical scale in nodes
@@ -43,15 +41,21 @@ local TOBS = 0.025 -- Obsidian tube width
 
 local ORECHA = 1 / 5 ^ 3 -- Ore chance per stone node
 			-- 1 / n ^ 3 where n = average distance between ores
-local BOLCHA = 1 / 32 ^ 2 -- Boulder maximum chance per grass node.
-			-- 1 / n ^ 2 where n = average minimum distance between flora
-local APPCHA = 1 / 5 ^ 2 -- Appletree maximum chance per grass node
-local PINCHA = 1 / 6 ^ 2 -- Pinetree maximum chance per grass node
-local JUNCHA = 1 / 4 ^ 2 -- Jungletree maximum chance per grass node
-local GRACHA = 1 / 5 ^ 2 -- Grasses maximum chance per grass node
-local FLOCHA = 1 / 61 ^ 2 -- Flower chance per grass node
-local LOTET = -0.4 -- Low temperature threshold for taiga/snowyplains
-local HITET = 0.4 -- High temperature threshold for Rainforest
+local BOLCHA = 1 / 127 ^ 2 -- Boulder maximum chance per surface node
+			-- 1 / n ^ 2 where n = average distance between features
+local APPCHA = 1 / 5 ^ 2 -- Appletree maximum chance per node
+local PINCHA = 1 / 6 ^ 2 -- Pinetree maximum chance per node
+local JUNCHA = 1 / 4 ^ 2 -- Jungletree maximum chance per node
+local ACACHA = 1 / 47 ^ 2 -- Acaciatree maximum chance per node
+local GRACHA = 1 / 4 ^ 2 -- Grasses maximum chance per node
+local FLOCHA = 1 / 37 ^ 2 -- Flower chance per node
+local CACCHA = 1 / 73 ^ 2 -- Cactus chance per node
+
+local LOTET = -0.4 -- Low temperature threshold
+local HITET = 0.4 -- High
+local LOHUT = -0.4 -- Low humidity threshold
+local MIDHUT = 0 -- Mid
+local HIHUT = 0.4 -- High
 
 -- 3D noise for highland terrain
 
@@ -64,18 +68,18 @@ local np_terrain = {
 	persist = 0.67
 }
 
--- 2D noise for mid terrain / river
+-- 2D noise for mid terrain / river / humidity
 
 local np_mid = {
 	offset = 0,
 	scale = 1,
-	spread = {x=768, y=768, z=768},
+	spread = {x=1536, y=1536, z=1536},
 	seed = 85546,
-	octaves = 5,
+	octaves = 6,
 	persist = 0.4
 }
 
--- 2D noise for base terrain
+-- 2D noise for base terrain / humidity
 
 local np_base = {
 	offset = 0,
@@ -115,7 +119,7 @@ local np_temp = {
 	scale = 1,
 	spread = {x=3072, y=3072, z=3072},
 	seed = 18882,
-	octaves = 4,
+	octaves = 3,
 	persist = 0.4
 }
 
@@ -130,6 +134,17 @@ local np_tree = {
 	persist = 0.6
 }
 
+-- 2D noise for grasses
+
+local np_grass = {
+	offset = 0,
+	scale = 1,
+	spread = {x=192, y=192, z=192},
+	seed = -138,
+	octaves = 4,
+	persist = 0.7
+}
+
 -- 3D noises for tunnels
 
 local np_weba = {
@@ -204,7 +219,7 @@ local function riverdev_pathbrush(x, y, z, area, data,
 	local c_stone = minetest.get_content_id("riverdev:stone")
 	local c_path = minetest.get_content_id("riverdev:path")
 	local c_wood = minetest.get_content_id("default:junglewood")
-	local c_ice = minetest.get_content_id("default:ice")
+	local c_snow = minetest.get_content_id("default:snow")
 	if wood and math.random() < 0.2 then
 		local vi = area:index(x, y-2, z)
 		for j = y-2, y0-16, -1 do -- use mapblock shell
@@ -226,8 +241,8 @@ local function riverdev_pathbrush(x, y, z, area, data,
 				data[vi] = c_path
 			end
 			if data[via] ~= c_path and data[via] ~= c_wood
-			and under[si] == 3 then
-				data[via] = c_ice
+			and under[si] == 2 then
+				data[via] = c_snow
 			end
 			vi = vi + 1
 			via = via + 1
@@ -238,17 +253,34 @@ local function riverdev_pathbrush(x, y, z, area, data,
 end
 
 local function riverdev_surface(x, y, z, area, data, y1, vi, viu,
-		n_abspatha, n_abspathb, n_tree, n_grass, n_temp, under, si)
+		n_abspatha, n_abspathb, n_tree, n_grass, n_temp, n_humid, under, si)
 	local c_grass = minetest.get_content_id("riverdev:grass")
 	local c_grass5 = minetest.get_content_id("default:grass_5")
 	local c_snowblock = minetest.get_content_id("default:snowblock")
 	local c_jungrass = minetest.get_content_id("default:junglegrass")
-	if under[si] == 1 then -- sand
-		if math.random() < BOLCHA
-		and n_abspatha > TPFLO and n_abspathb > TPFLO then
-			riverdev_boulder(x, y, z, area, data)
+	local c_dryshrub = minetest.get_content_id("default:dry_shrub")
+	local c_drygrass = minetest.get_content_id("riverdev:drygrass")
+	local c_goldengrass = minetest.get_content_id("riverdev:goldengrass")
+	local c_icydirt = minetest.get_content_id("riverdev:icydirt")
+	if under[si] == 1 then -- tundra
+		data[viu] = c_icydirt
+		if math.random() < GRACHA * n_grass then
+			data[vi] = c_dryshrub
 		end
-	elseif under[si] == 2 then -- forest/grassland
+	elseif under[si] == 2 then -- taiga
+		if math.random() < PINCHA * n_tree
+		and n_abspatha > TPFLO and n_abspathb > TPFLO then
+			riverdev_snowypine(x, y, z, area, data)
+		else
+			data[viu] = c_grass
+			data[vi] = c_snowblock
+		end
+	elseif under[si] == 3 then -- dry grassland
+		data[viu] = c_drygrass
+		if math.random() < GRACHA * n_grass then
+			data[vi] = c_dryshrub
+		end
+	elseif under[si] == 4 then -- forest/grassland
 		if math.random() < BOLCHA
 		and n_abspatha > TPFLO and n_abspathb > TPFLO then
 			riverdev_boulder(x, y, z, area, data)
@@ -266,15 +298,20 @@ local function riverdev_surface(x, y, z, area, data, y1, vi, viu,
 				data[vi] = c_grass5
 			end
 		end
-	elseif under[si] == 3 then -- taiga
-		if math.random() < PINCHA * n_tree
-		and n_abspatha > TPFLO and n_abspathb > TPFLO then
-			riverdev_snowypine(x, y, z, area, data)
-		else
-			data[viu] = c_grass
-			data[vi] = c_snowblock
+	elseif under[si] == 5 then -- desert
+		if math.random() < CACCHA * n_grass then
+			riverdev_cactus(x, y, z, area, data)
 		end
-	elseif under[si] == 4 then -- rainforest
+	elseif under[si] == 6 then
+		if math.random() < ACACHA * n_tree then
+			riverdev_acaciatree(x, y, z, area, data)
+		else
+			data[viu] = c_drygrass
+			if math.random() < GRACHA * n_grass then
+				data[vi] = c_goldengrass
+			end
+		end
+	elseif under[si] == 7 then -- rainforest
 		if math.random() < JUNCHA
 		and n_abspatha > TPFLO / 2 and n_abspathb > TPFLO / 2 then
 			riverdev_jungletree(x, y, z, area, data, y1)
@@ -284,7 +321,12 @@ local function riverdev_surface(x, y, z, area, data, y1, vi, viu,
 				data[vi] = c_jungrass
 			end
 		end
-	elseif under[si] == 5 and n_temp < LOTET then -- stone
+	elseif under[si] == 8 then -- sand
+		if math.random() < BOLCHA
+		and n_abspatha > TPFLO and n_abspathb > TPFLO then
+			riverdev_boulder(x, y, z, area, data)
+		end
+	elseif under[si] == 9 and n_temp < LOTET then -- stone
 			data[vi] = c_snowblock
 	end
 end
@@ -321,6 +363,7 @@ minetest.register_on_generated(function(minp, maxp, seed)
 	local c_obsidian = minetest.get_content_id("default:obsidian")
 	local c_jungrass = minetest.get_content_id("default:junglegrass")
 	local c_ice = minetest.get_content_id("default:ice")
+	local c_desand = minetest.get_content_id("default:desert_sand")
 	local c_stodiam = minetest.get_content_id("default:stone_with_diamond")
 	local c_stomese = minetest.get_content_id("default:stone_with_mese")
 	local c_stogold = minetest.get_content_id("default:stone_with_gold")
@@ -336,6 +379,7 @@ minetest.register_on_generated(function(minp, maxp, seed)
 	local c_mixwater = minetest.get_content_id("riverdev:mixwater")
 	local c_freshwaterflow = minetest.get_content_id("riverdev:freshwaterflow")
 	local c_mixwaterflow = minetest.get_content_id("riverdev:mixwaterflow")
+	local c_permafrost = minetest.get_content_id("riverdev:permafrost")
 	
 	local sidelen = x1 - x0 + 1 -- mapgen chunk side length
 	local overlen = sidelen + 1 -- perlinmap overgeneration horizontal side length
@@ -360,6 +404,7 @@ minetest.register_on_generated(function(minp, maxp, seed)
 	local nvals_pathb = minetest.get_perlin_map(np_pathb, chulensxz):get2dMap_flat(minposxz)
 	local nvals_temp = minetest.get_perlin_map(np_temp, chulensxz):get2dMap_flat(minposxz)
 	local nvals_tree = minetest.get_perlin_map(np_tree, chulensxz):get2dMap_flat(minposxz)
+	local nvals_grass = minetest.get_perlin_map(np_grass, chulensxz):get2dMap_flat(minposxz)
 	
 	--local noiset = math.ceil((os.clock() - t0) * 1000)
 	--print ("[riverdev] noise "..noiset.." ms")
@@ -383,10 +428,6 @@ minetest.register_on_generated(function(minp, maxp, seed)
 			local nodidu = data[viu]
 			local chunkxz = x >= x0 and z >= z0
 
-			local n_temp = nvals_temp[nixz]
-			local n_tree = math.min(math.max(nvals_tree[nixz], 0), 1)
-			local n_grass = math.min(math.max(-nvals_tree[nixz], 0), 1)
-
 			local n_patha = nvals_patha[nixz]
 			local n_abspatha = math.abs(n_patha)
 			local n_zprepatha = nvals_patha[(nixz - overlen)]
@@ -424,7 +465,11 @@ minetest.register_on_generated(function(minp, maxp, seed)
 			local tobs = TOBS + (density + tstone)
 			local n_strata = nvals_strata[nixyz]
 			local densitystrata = grad + n_strata * 0.5
-				
+			local n_humid = n_absbase - n_absmid
+			local n_temp = nvals_temp[nixz]
+			local n_tree = math.min(math.max(nvals_tree[nixz], 0), 1)
+			local n_grass = math.min(math.max(nvals_grass[nixz], 0), 1)
+
 			if chunkxz and y == y0 - 1 then -- overgeneration, initialise tables
 				under[si] = 0
 				if ungen then -- guess by calculating density
@@ -482,7 +527,7 @@ minetest.register_on_generated(function(minp, maxp, seed)
 						data[vi] = c_stone -- stone
 					end
 					stable[si] = stable[si] + 1
-					under[si] = 5
+					under[si] = 9
 				elseif y > YSAND
 				and ((not wood and density < 0 and under[si] ~= 0)
 				or (wood and densitybase > trsand * 2 and densitybase < trsand * 2 + 0.002))
@@ -498,16 +543,34 @@ minetest.register_on_generated(function(minp, maxp, seed)
 				and stable[si] >= 2 and nodid ~= c_stone then -- do not replace boulder
 					if y <= YSAND or densitybase >= trsand then
 						data[vi] = c_sand
-						under[si] = 1
-					elseif n_temp < LOTET then -- taiga/snowyplains
-						data[vi] = c_dirt
-						under[si] = 3
-					elseif n_temp > HITET then -- rainforest
-						data[vi] = c_dirt
-						under[si] = 4
+						under[si] = 8
+					elseif n_temp < LOTET then
+						if n_humid < MIDHUT then -- tundra
+							data[vi] = c_permafrost
+							under[si] = 1
+						else -- taiga
+							data[vi] = c_dirt
+							under[si] = 2
+						end
+					elseif n_temp > HITET then
+						if n_humid < LOHUT then -- desert
+							data[vi] = c_desand
+							under[si] = 5
+						elseif n_humid > HIHUT then -- savanna
+							data[vi] = c_dirt
+							under[si] = 6
+						else -- rainforest
+							data[vi] = c_dirt
+							under[si] = 7
+						end
 					else
-						data[vi] = c_dirt -- deciduous forest/grassland
-						under[si] = 2
+						if n_humid < MIDHUT then -- drygrass
+							data[vi] = c_dirt
+							under[si] = 3
+						else -- deciduous forest / grassland
+							data[vi] = c_dirt
+							under[si] = 4
+						end
 					end
 				elseif y <= YWATER and density < tstone and nodid ~= c_stone then -- sea water
 					data[vi] = c_water
@@ -528,7 +591,7 @@ minetest.register_on_generated(function(minp, maxp, seed)
 				and nodid ~= c_wood and nodidu ~= c_wood then
 
 					riverdev_surface(x, y, z, area, data, y1, vi, viu,
-					n_abspatha, n_abspathb, n_tree, n_grass, n_temp, under, si)
+					n_abspatha, n_abspathb, n_tree, n_grass, n_temp, n_humid, under, si)
 
 					stable[si] = 0
 					under[si] = 0
@@ -555,7 +618,7 @@ minetest.register_on_generated(function(minp, maxp, seed)
 				and nodid ~= c_wood and nodidu ~= c_wood then
 
 					riverdev_surface(x, y, z, area, data, y1, vi, viu,
-					n_abspatha, n_abspathb, n_tree, n_grass, n_temp, under, si)
+					n_abspatha, n_abspathb, n_tree, n_grass, n_temp, n_humid, under, si)
 
 				end
 			end
diff --git a/nodes.lua b/nodes.lua
index 2661f30..7a8af72 100644
--- a/nodes.lua
+++ b/nodes.lua
@@ -174,6 +174,121 @@ minetest.register_node("riverdev:jungling", {
 	sounds = default.node_sound_leaves_defaults(),
 })
 
+
+minetest.register_node("riverdev:acaciatree", {
+	description = "Acacia tree",
+	tiles = {"riverdev_acaciatreetop.png", "riverdev_acaciatreetop.png", "riverdev_acaciatree.png"},
+	paramtype2 = "facedir",
+	is_ground_content = false,
+	groups = {tree=1,choppy=2,oddly_breakable_by_hand=1,flammable=2},
+	sounds = default.node_sound_wood_defaults(),
+	on_place = minetest.rotate_node
+})
+
+minetest.register_node("riverdev:acacialeaf", {
+	description = "Acacia leaves",
+	drawtype = "allfaces_optional",
+	visual_scale = 1.3,
+	tiles = {"riverdev_acacialeaf.png"},
+	paramtype = "light",
+	is_ground_content = false,
+	groups = {snappy=3, flammable=2, leaves=1},
+	drop = {
+		max_items = 1,
+		items = {
+			{items = {"riverdev:acacialing"},rarity = 20},
+			{items = {"riverdev:acacialeaf"}}
+		}
+	},
+	sounds = default.node_sound_leaves_defaults(),
+})
+
+minetest.register_node("riverdev:acacialing", {
+	description = "Acacia tree sapling",
+	drawtype = "plantlike",
+	visual_scale = 1.0,
+	tiles = {"riverdev_acacialing.png"},
+	inventory_image = "riverdev_acacialing.png",
+	wield_image = "riverdev_acacialing.png",
+	paramtype = "light",
+	walkable = false,
+	is_ground_content = false,
+	selection_box = {
+		type = "fixed",
+		fixed = {-0.3, -0.5, -0.3, 0.3, 0.35, 0.3}
+	},
+	groups = {snappy=2,dig_immediate=3,flammable=2,attached_node=1},
+	sounds = default.node_sound_leaves_defaults(),
+})
+
+minetest.register_node("riverdev:acaciawood", {
+	description = "Acacia wood planks",
+	tiles = {"riverdev_acaciawood.png"},
+	groups = {choppy=2,oddly_breakable_by_hand=2,flammable=3,wood=1},
+	sounds = default.node_sound_wood_defaults(),
+})
+
+minetest.register_node("riverdev:goldengrass", {
+	description = "Golden grass",
+	drawtype = "plantlike",
+	tiles = {"riverdev_goldengrass.png"},
+	inventory_image = "riverdev_goldengrass.png",
+	wield_image = "riverdev_goldengrass.png",
+	paramtype = "light",
+	walkable = false,
+	buildable_to = true,
+	is_ground_content = false,
+	groups = {snappy=3,flammable=3,flora=1,attached_node=1},
+	sounds = default.node_sound_leaves_defaults(),
+	selection_box = {
+		type = "fixed",
+		fixed = {-0.5, -0.5, -0.5, 0.5, -5/16, 0.5},
+	},
+})
+
+minetest.register_node("riverdev:drygrass", {
+	description = "Dry grass",
+	tiles = {"riverdev_drygrass.png"},
+	is_ground_content = false,
+	groups = {crumbly=1,soil=1},
+	drop = "default:dirt",
+	sounds = default.node_sound_dirt_defaults({
+		footstep = {name="default_grass_footstep", gain=0.4},
+	}),
+})
+
+minetest.register_node("riverdev:icydirt", {
+	description = "Icy dirt",
+	tiles = {"riverdev_icydirt.png"},
+	is_ground_content = false,
+	groups = {crumbly=1},
+	drop = "default:dirt",
+	sounds = default.node_sound_dirt_defaults({
+		footstep = {name="default_snow_footstep", gain=0.15},
+		dug = {name="default_snow_footstep", gain=0.45},
+	}),
+})
+
+minetest.register_node("riverdev:permafrost", {
+	description = "Permafrost",
+	tiles = {"riverdev_permafrost.png"},
+	is_ground_content = false,
+	groups = {crumbly=1},
+	drop = "default:dirt",
+	sounds = default.node_sound_dirt_defaults(),
+})
+
+minetest.register_node("riverdev:cactus", {
+	description = "Cactus",
+	tiles = {"default_cactus_top.png", "default_cactus_top.png", "default_cactus_side.png"},
+	paramtype2 = "facedir",
+	is_ground_content = false,
+	groups = {snappy=1,choppy=3,flammable=2},
+	drop = "default:cactus",
+	sounds = default.node_sound_wood_defaults(),
+	on_place = minetest.rotate_node
+})
+
 minetest.register_node("riverdev:freshwater", {
 	description = "Fresh Water Source",
 	inventory_image = minetest.inventorycube("riverdev_freshwater.png"),
@@ -333,6 +448,13 @@ minetest.register_craft({
 	}
 })
 
+minetest.register_craft({
+	output = "riverdev:acaciawood 4",
+	recipe = {
+		{"riverdev:acaciatree"},
+	}
+})
+
 -- Register stairs and slabs
 
 stairs.register_stair_and_slab(
@@ -345,3 +467,13 @@ stairs.register_stair_and_slab(
 	default.node_sound_wood_defaults()
 )
 
+stairs.register_stair_and_slab(
+	"acaciawood",
+	"riverdev:acaciawood",
+	{snappy=2,choppy=2,oddly_breakable_by_hand=2,flammable=3},
+	{"riverdev_acaciawood.png"},
+	"Acaciawood stair",
+	"Acaciawood slab",
+	default.node_sound_wood_defaults()
+)
+
diff --git a/textures/riverdev_acacialeaf.png b/textures/riverdev_acacialeaf.png
new file mode 100644
index 0000000..08cf399
Binary files /dev/null and b/textures/riverdev_acacialeaf.png differ
diff --git a/textures/riverdev_acacialing.png b/textures/riverdev_acacialing.png
new file mode 100644
index 0000000..07170a0
Binary files /dev/null and b/textures/riverdev_acacialing.png differ
diff --git a/textures/riverdev_acaciatree.png b/textures/riverdev_acaciatree.png
new file mode 100644
index 0000000..169823d
Binary files /dev/null and b/textures/riverdev_acaciatree.png differ
diff --git a/textures/riverdev_acaciatreetop.png b/textures/riverdev_acaciatreetop.png
new file mode 100644
index 0000000..2cf5ef0
Binary files /dev/null and b/textures/riverdev_acaciatreetop.png differ
diff --git a/textures/riverdev_acaciawood.png b/textures/riverdev_acaciawood.png
new file mode 100644
index 0000000..f5e6a68
Binary files /dev/null and b/textures/riverdev_acaciawood.png differ
diff --git a/textures/riverdev_drygrass.png b/textures/riverdev_drygrass.png
new file mode 100644
index 0000000..a2c553a
Binary files /dev/null and b/textures/riverdev_drygrass.png differ
diff --git a/textures/riverdev_goldengrass.png b/textures/riverdev_goldengrass.png
new file mode 100644
index 0000000..50f6a66
Binary files /dev/null and b/textures/riverdev_goldengrass.png differ
diff --git a/textures/riverdev_icydirt.png b/textures/riverdev_icydirt.png
new file mode 100644
index 0000000..0c2868f
Binary files /dev/null and b/textures/riverdev_icydirt.png differ
diff --git a/textures/riverdev_permafrost.png b/textures/riverdev_permafrost.png
new file mode 100644
index 0000000..086e1d8
Binary files /dev/null and b/textures/riverdev_permafrost.png differ