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40d:Chasm
Chasms appear similarly to rivers, but are not visible on the Local/Region/World maps. They are similar to the DFv0.23 chasms except that they are not guaranteed, seem to use the same river-generation code for the fortress map (a "chasm tributary" has been observed), and occupy all depths.
Chasms are much more common on named mountains and volcanoes, along with other special features such as cave rivers.
Chasms are possibly the only feature that can create Extreme Cliffs (20+) that may be observed on the Local Map.
Chasms can also appear in a rounded shape, as below:
Uses
A technique of building a platform over the chasm, and then severing the platform from the wall, can permanently dispose of garbage or excess stone set on top.
It may still be possible to chasm refuse as it was in earlier versions. Try designating a garbage dump activity zone over the chasm. Monsters may also spring from the chasm, and were provoked by the chasming of refuse in previous versions. It is unknown if these events still occur.