Minecraft wiki entry for Canyon, associated text: Canyons can have small ledges along the top. They can be found at levels 10 to 72, sometimes appearing on the world surface or underwater, forming canyons. They can go deep underground, sometimes spawning slimes or exposing diamond ore. If they reach deep enough, they may also be floored by the lava lakes at level -55. Canyons can cut from surface level all the way down to bedrock, especially noticeable in the Amplified world type.