Swamp

Swamps are mild, murky biomes. There are two variants in the biome family.

Description
Swamp is an overall flat biome, with low elevation often below sea level. Many parts of swamps are flooded, from marsh-like patches of single blocks of grass forming in shallow water to big lakes, with patches of clay often forming on their bottom. Water in swamps have grey-brown color on surface, turning pale yellow when submerged in it. Unlike most biomes, parts of swamps have varying temperatures, which affects color of grass blocks, grass and leaves.

Vegetation include 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 are found growing in swamps and lily Pads are growing commonly on water surface. Both are found exclusively in swamps. Huge mushrooms can generate as well.

Swamp huts can be rarely found in swamp, housing a witch and a black cat. These cannot despawn. Only witches can spawn in and around the hut. Swamps, alongside deserts, can rarely generate fossils, very rare structures found underground.

Slimes can spawn in swamps at low light levels, alongside common monsters, between height Y:50 - 70 and their spawn rate is affected by the moon phase, spawning most often on full moon and not spawning at all on new moon.

Swamp biomes are usually found next to other lush biomes, such as forests, dark forests, birch forests, and plains biomes.

Survival in swamps can be somewhat easy if the player finds a large-enough clearing for a shelter. Wood supply is good without being overwhelming, water is abundant, and terrain is often flat. Swamp huts can also be converted into witch farms, should the player want to easily harvest their drops. However, slimes spawning alongside hostile mobs can make nighttime survival more difficult if the player doesn't light up their surroundings.

Variants
There are a total of two different swamp biome variants.

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 outside of slime chunks where slimes can be found. Swamp huts and fossils also generate in this biome.

Swamp Hills
The Swamp Hills variant features hillier terrain rising up between the flat marshes. These hills are generally shorter than the hills in other biomes, though can still tower over the otherwise low-elevation swamp. Additionally, flooded areas in swamp hills tend to reach lower depths than the rest of the swamp, sometimes deep enough to have a gravel floor in place of a dirt floor, like normal oceans. Swamp huts will not generate in swamp hills, nor will slimes spawn, but fossils may still generate underground. Additionally, seagrass does not generate in flooded areas of swamp hills.

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.