Swamp

Swamps are temperate biomes where swamp huts containing witches and black cats generate, slimes and frogs can spawn and which are forested with trees covered with vines, dead bushes, mushrooms and blue orchids.

Description
Swamps are mostly flat biomes, with elevations low enough to go below sea level throughout much of the area. Large portions of swamps are flooded, from marsh-like patches of single blocks of grass forming in shallow water, to large lakes, with patches of clay on the lakebed. Water in swamps takes on a gray-green color at the surface, turning pale yellow when submerged in it. Unlike most biomes, swamps have varying temperatures, which affects the color of grass blocks, grass and leaves.

Rarely, a swamp can generate dry, without any water, although the vegetation still takes on the swamp colors. Vegetation includes oak trees, that can grow in shallow water and generate with vines growing on them. Sugar cane is found often growing on shores, while seagrass litters the bottom of flooded areas. Blue orchids may grow among the grass, while lily pads dot the surfaces of lakes; both are found exclusively in swamps. $$, huge mushrooms can generate as well.

Rarely, a swamp may include a swamp hut, housing a witch and a black cat. Only witches can spawn in and around the hut. Swamps, alongside deserts, can generate fossils, rare structures found underground around Y=50.

Slimes can spawn in swamps at low light levels, alongside common monsters, between elevations of Y=50 and Y=70 (exclusive). Their spawn rate is affected by the moon phase, spawning most often during full moon and not spawning at all during new moon.

Villagers that spawn in swamps get a unique swamp-themed look. While villagers have swamp-specific types, no village featuring exclusively these villagers can be generated. The only way for these villagers to spawn is either by being bred in swamp or curing a zombie villager that spawned in a swamp.

Swamp biomes are usually found in flat terrain near sea level in regions with very high erosion values, and they also replace rivers in these areas. Swamps can be found in almost all temperature regions with the exception of snowy regions.

Variants
Although this biome currently has only a single variant, one removed variant (swamp hills) could be found in previous versions.

Swamp
The swamp biome is the standard swamp variant. Non-flooded areas of this biome feature relatively flat terrain, similarly to plains biomes, though with significantly more trees and less tall grass. $$, some parts of the swamp may have marsh-like terrain, where the grass has multiple single blocks of water generating within it. At nighttime, depending on the moon phase, slimes may spawn at Y-levels 50-70 alongside other hostile mobs, making swamps the only places aboveground where slimes can be found. Swamp huts and fossils also generate in this biome.

In Java Edition:

In Bedrock Edition:

Mangrove Swamp
The mangrove swamp is a variant of the swamp biome that generates in warmer regions, usually next to jungles and deserts. The foliage in this biome is very dense featuring plenty of mangrove trees which vary a lot in height. The floor is mainly composed of mud blocks with occasional grass patches. The grass has the same color as the normal swamp but leaves and vines have a unique light green tint and the water is teal rather than gray. Frogs are the only passive animals that spawn in this biome and all frogs spawned here are warm frogs.

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Gallery
Note that images with blue water were taken before Java Edition 1.13, which changed the color of water in swamps from blue to gray.