There are two main bases present in Chasms. There are also two Forerunner Supply Elevators and two additional rebel bases to destroy near the 2 main bases, both being guarded by several rebel squads. Some of the terrain is Forerunner architecture, such as metal floors with smooth textures with Forerunner patterns, much like the designs on the outer side of the Halo Installations, and Forerunner walls on the edges of the map. There are also many chasms present in the map, hence the name.