From Halopedia, the Halo wiki
Set in a previously human urban environment, now seemingly abandoned and being encroached upon by a dense jungle, the map itself exists on Arcadia in proximity of an ONI base, as evidenced by Marine chatter when playing the level, as well as multiple ONI structures seen in the level. The four starting base locations are set in the four corners of the map, and there are six extra base locations, all of them occupied by a Rebel Base.
Each of the six possible base locations are strategically placed in a crater like area, so that there is only one direction from which it can be assaulted. Also, on the map are eight building sites, which are positioned next to one another in groups of two with a free turret slot, one group of two near each starting base. They are small locations upon which a player can build a single building (not base, but base addition), which are defended by small groups of Rebels. In the center of the map, there is a Forerunner Lifesupport Pod, which increases the maximum population limit of whomever controls it. The Forerunner Lifesupport Pod is guarded by more powerful rebels, requiring a reasonably heavier force than normal to control it.