Caves are created as part of a new world. They are laid out in curves of varying degree and direction. They can be large or small and can connect (or nearly) with other caves forming a cave system. They sometimes open to the surface giving easy access, particularly in mountains, but may also be sealed with layers of dirt or sand. Mining is required to reach most caves.
A cave can be as narrow as a string of single-block hollows separated by several blocks of stone or large enough to be difficult to illuminate with a single source of light. Otherwise open segments may be separated by stone barriers one or more blocks thick. They can be nearly straight or highly uneven.
Cave-like gaps can also be found in the stone base of a floating island.
All caves have a "back wall" of stone, also known as bedrock.
- No native species
Water may fill parts of some caves. Caution is recommended to avoid unintentional flooding.