diff --git a/mods/MAPGEN/mcl_biomes/init.lua b/mods/MAPGEN/mcl_biomes/init.lua
index e4e172a470..6103dcf073 100644
--- a/mods/MAPGEN/mcl_biomes/init.lua
+++ b/mods/MAPGEN/mcl_biomes/init.lua
@@ -114,7 +114,7 @@ local function register_biomes()
 		depth_filler = 3,
 		node_riverbed = "mcl_core:dirt",
 		depth_riverbed = 2,
-		y_min = 15,
+		y_min = 1,
 		y_max = mcl_vars.mg_overworld_max,
 		heat_point = 26,
 		humidity_point = 72,
@@ -129,7 +129,7 @@ local function register_biomes()
 		node_riverbed = "mcl_core:dirt",
 		depth_riverbed = 2,
 		y_min = mcl_vars.mg_overworld_min,
-		y_max = 1,
+		y_max = 0,
 		heat_point = 26,
 		humidity_point = 72,
 	})
@@ -232,14 +232,14 @@ local function register_biomes()
 		node_riverbed = "mcl_core:sand",
 		depth_riverbed = 2,
 		y_min = 1,
-		y_max = 56,
+		y_max = 3,
 		heat_point = 47,
 		humidity_point = 73,  --was 70
 	})
 
 	minetest.register_biome({
 		name = "coniferous_forest_ocean",
-		node_top = "mcl_core:dirt",
+		node_top = "mcl_core:sand",
 		depth_top = 1,
 		node_filler = "mcl_core:dirt",
 		depth_filler = 3,
@@ -334,7 +334,7 @@ local function register_biomes()
 		node_riverbed = "mcl_core:sand",
 		depth_riverbed = 2,
 		node_stone = "mcl_core:sandstone",
-		y_min = 0,
+		y_min = 1,
 		y_max = mcl_vars.mg_overworld_max,
 		heat_point = 57,
 		humidity_point = 0,  --was 0
@@ -349,7 +349,7 @@ local function register_biomes()
 		node_riverbed = "mcl_core:sand",
 		depth_riverbed = 2,
 		y_min = mcl_vars.mg_overworld_min,
-		y_max = 4,
+		y_max = 0,
 		heat_point = 57,
 		humidity_point = 0,  --was 0
 	})
@@ -392,13 +392,26 @@ local function register_biomes()
 		depth_filler = 1,
 		node_riverbed = "mcl_core:redsand",
 		depth_riverbed = 2,
-		node_stone = "mcl_colorblocks:hardened_clay",
-		y_min = -35,
+		node_stone = "mcl_core:stone",
+		y_min = 1,
 		y_max = mcl_vars.mg_overworld_max,
 		heat_point = 88,
 		humidity_point = 20,
 	})
 
+	minetest.register_biome({
+		name = "mesa_ocean",
+		node_top = "mcl_core:redsand",
+		depth_top = 1,
+		node_filler = "mcl_core:redsand",
+		depth_filler = 2,
+		node_riverbed = "mcl_core:redsand",
+		depth_riverbed = 2,
+		y_min = mcl_vars.mg_overworld_min,
+		y_max = 0,
+		heat_point = 88,
+		humidity_point = 20,
+	})
 
 	-- Savanna
 	minetest.register_biome({
@@ -515,33 +528,6 @@ local function register_biomes()
 		humidity_point = 99,
 	})
 
-
-	--cold
-	minetest.register_biome({
-		name = "mushroom_cold",
-		node_dust = "mcl_core:snow",
-		node_top = "mcl_core:mycelium_snow",
-		depth_top = 1,
-		node_filler = "mcl_core:coarse_dirt",
-		depth_filler = 3,
-		node_riverbed = "mcl_core:dirt",
-		depth_riverbed = 2,
-		y_min = 56,
-		y_max = mcl_vars.mg_overworld_max,
-		heat_point = -13,
-		humidity_point = 30,
-	})
-
-
-
-	-- Underground in Overworld
-	minetest.register_biome({
-		name = "underground",
-		y_min = mcl_vars.mg_overworld_min,
-		y_max = mcl_util.layer_to_y(61),
-		heat_point = 50,
-		humidity_point = 50,
-	})
 end
 
 -- Register biomes of non-Overworld biomes
@@ -1409,7 +1395,7 @@ local function register_decorations()
 		y_min = 4,
 		y_max = mcl_vars.mg_overworld_max,
 		decoration = "mcl_core:cactus",
-		biomes = {"red_desert","desert","grassland_dunes", "coniferous_forest_dunes"},
+		biomes = {"red_desert","desert"},
 		height = 1,
 		height_max = 3,
 	})
diff --git a/mods/MAPGEN/mcl_mapgen_core/init.lua b/mods/MAPGEN/mcl_mapgen_core/init.lua
index 2325fdac38..1cdd8e62a6 100644
--- a/mods/MAPGEN/mcl_mapgen_core/init.lua
+++ b/mods/MAPGEN/mcl_mapgen_core/init.lua
@@ -938,7 +938,7 @@ minetest.register_on_generated(function(minp, maxp, seed)
 			local cx = minp.x + math.floor((divx+0.5)*divlen)
 			local cz = minp.z + math.floor((divz+0.5)*divlen)
 			if minetest.get_node({x=cx,y=1,z=cz}).name == "mcl_core:water_source" and
-					minetest.get_node({x=cx,y=0,z=cz}).name == "mcl_core:sand" then
+					minetest.get_item_group(minetest.get_node({x=cx,y=0,z=cz}).name, "sand") == 1 then
 				local is_shallow = true
 				local num_water_around = 0
 				if minetest.get_node({x=cx-divlen*2,y=1,z=cz+0}).name == "mcl_core:water_source" then
@@ -955,7 +955,7 @@ minetest.register_on_generated(function(minp, maxp, seed)
 				if is_shallow then
 					for x1=-divlen,divlen do
 					for z1=-divlen,divlen do
-						if minetest.get_node({x=cx+x1,y=0,z=cz+z1}).name == "mcl_core:sand" or minetest.get_node({x=cx+x1,y=0,z=cz+z1}).name == "mcl_core:sandstone" then
+						if minetest.get_item_group(minetest.get_node({x=cx+x1,y=0,z=cz+z1}).name, "sand") == 1 then
 							minetest.set_node({x=cx+x1,y=0,z=cz+z1}, {name="mcl_core:clay"})
 						end
 					end