diff --git a/mappings/net/minecraft/world/biome/source/BiomeAccess.mapping b/mappings/net/minecraft/world/biome/source/BiomeAccess.mapping
index 890190b634..42125adedb 100644
--- a/mappings/net/minecraft/world/biome/source/BiomeAccess.mapping
+++ b/mappings/net/minecraft/world/biome/source/BiomeAccess.mapping
@@ -2,6 +2,7 @@ CLASS net/minecraft/class_4543 net/minecraft/world/biome/source/BiomeAccess
 	FIELD field_20640 storage Lnet/minecraft/class_4543$class_4544;
 	FIELD field_20641 seed J
 	FIELD field_20642 type Lnet/minecraft/class_4545;
+	FIELD field_28106 CHUNK_CENTER_OFFSET I
 	METHOD <init> (Lnet/minecraft/class_4543$class_4544;JLnet/minecraft/class_4545;)V
 		ARG 1 storage
 		ARG 2 seed
diff --git a/mappings/net/minecraft/world/biome/source/BiomeCoords.mapping b/mappings/net/minecraft/world/biome/source/BiomeCoords.mapping
new file mode 100644
index 0000000000..07bc9e8829
--- /dev/null
+++ b/mappings/net/minecraft/world/biome/source/BiomeCoords.mapping
@@ -0,0 +1,34 @@
+CLASS net/minecraft/class_5742 net/minecraft/world/biome/source/BiomeCoords
+	COMMENT Utility class for converting between biome coordinates and block or chunk
+	COMMENT coordinates.
+	COMMENT
+	COMMENT <p>Modders should use this class as Mojang may change the biome coordinate to
+	COMMENT block or chunk coordinate ratio in the future again.
+	COMMENT
+	COMMENT @apiNote A biome voxel comprises of 4×4×4 block voxels, as that's how biomes
+	COMMENT are stored in game after 19w36a. Each chunk section has 4×4×4 biome
+	COMMENT voxels as a result.
+	METHOD method_33100 fromBlock (I)I
+		COMMENT Converts a block x, y, or z to a biome x, y, or z.
+		COMMENT
+		COMMENT @implSpec This implementation returns {@code blockCoord / 4}.
+		ARG 0 blockCoord
+			COMMENT a block x, y, or z
+	METHOD method_33101 toBlock (I)I
+		COMMENT Converts a biome x, y, or z to a block x, y, or z.
+		COMMENT
+		COMMENT @implSpec This implementation returns {@code blockCoord * 4}.
+		ARG 0 biomeCoord
+			COMMENT a biome x, y, or z
+	METHOD method_33102 fromChunk (I)I
+		COMMENT Converts a chunk x or z to a biome x or z.
+		COMMENT
+		COMMENT @implSpec This implementation returns {@code chunkCoord * 4}.
+		ARG 0 chunkCoord
+			COMMENT a chunk x or z
+	METHOD method_33103 toChunk (I)I
+		COMMENT Converts a biome x or z to a chunk x or z.
+		COMMENT
+		COMMENT @implSpec This implementation returns {@code biomeCoord / 4}.
+		ARG 0 biomeCoord
+			COMMENT a biome x or z