Mushroom Fields

Mushroom fields or mushroom islands are rare biomes which always generate as islands surrounded by deep oceans. They are the only place in the game where mycelium and mooshrooms are found, and have the special property that no hostile mobs normally spawn in them.

Mushroom fields make up about 0.15% of the Overworld's area. They generate in areas where the continentalness values are the lowest, meaning they almost always generate as islands very far away from major landmasses, and are bordered by deep ocean biomes of any temperature. This means that ocean monuments generate almost always next to mushroom fields.

The islands have the occasional tendency to be close to one another, resulting in multiple mushroom fields separated by only a few hundred blocks. It is nearly impossible for the player to spawn in the mushroom fields biome.