Coagulation
From Halopedia, the Halo wiki
Summary
Coagulation is the sister level of Blood Gulch, that was recreated for Halo 2. Some improvements to the stage include an underground entrance to a Banshee, a wooded area and a rock slide for sniping the enemy. It's dull name is Coagulatianous Canyon, but is called Coagulation for short, and some people just call it "Coag"