Backwash
From Halopedia, the Halo wiki
Summary
Backwash is a multiplayer level in Halo 2, similiar to the campaign level on Halo 1 called 343 Guilty Spark. It is a large rainforest set on Delta Halo. You can tell it is Delta Halo, not Alpha Halo, as 2401 Penitent Tangent can be seen floating around and humming to himself.
