What is in the swamp biome in Minecraft?

Shallow water, lily pads and oak trees draped in vines. The only biome where slimes spawn on the surface and witches live in huts. Slimeballs from surface slimes (spawn rates peak at full moon); Witch huts (cat and witch spawns, crafting table + cauldron); Blue orchids, lily pads, vines and clay disks; Mangrove swamp variant: mangrove wood, mud and frogs.

What structures generate in the swamp biome?

Witch huts. Fossils generate underground.

Swamp

Overworld (temperate)

Shallow water, lily pads and oak trees draped in vines. The only biome where slimes spawn on the surface and witches live in huts.

A Minecraft swamp with shallow water and oak trees — Swamp oaks and shallow water. Gameplay screenshot by Dabmasterars via Wikimedia Commons, CC BY 3.0.

Resources

Slimeballs from surface slimes (spawn rates peak at full moon)
Witch huts (cat and witch spawns, crafting table + cauldron)
Blue orchids, lily pads, vines and clay disks
Mangrove swamp variant: mangrove wood, mud and frogs

Mobs

Slimes at night (light below 8, Y 51-69, moon-dependent)
Witches in huts; bogged (poison-arrow skeletons) in swamps and mangroves (1.21)
Frogs and tadpoles (mangrove variant)

Structures

Witch huts
Fossils generate underground

Why go

Surface slimeballs without digging to Y=40 - wait for full moon nights
Frogs for froglights (feed them small magma cubes)
Mud and mangrove wood palettes from the mangrove variant

Tips

Slime rates are zero at new moon - check the moon before an AFK session.
Witch huts make compact witch farms (redstone, glowstone, gunpowder) with a small spawn volume.

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