Water lake

A water lake was a small, widespread, naturally-generated terrain feature that contains a volume of fluids water.

Description
Water lakes, which were small pools of water source blocks, could generate above sea level or inside caverns. They could also generate isolated underground, connected to no other structures whatsoever. When in a snowy biome, these small lakes are never initially frozen but turn to ice if exposed.

Water lakes generated with a small air pocket above them, which might result in floating sand, floating snow cover or even floating trees above the lake.

Generation
Water lakes were most common, generating in almost all Overworld biomes excluding the desert and desert hills biome. In Java Edition, the air pockets above water lakes were generated with cave air instead of normal air. This was true even for lakes that are exposed to the open sky.

Dungeons were able to generate attached to water lakes.

Gallery
Lago de agua 水湖