Blood Gulch is a multiplayer map in the first-person shooter Halo video game series. It first appeared in Halo: Combat Evolved, and was remade for Halo 2 as "Coagulation", as well as for Halo: Reach as "Hemorrhage" and Halo: The Master Chief Collection as "Bloodline". It also had spiritual successors in Halo 3's "Valhalla", in Halo 4 and Halo Wars as "Ragnarok", and in Halo 5's "Basin". Taking place in a canyon on the Halo ringworld that resembles the American Southwest, it was designed for the Capture the flag game mode but can also be used for other modes, such as deathmatch. Blood Gulch was one of Halo's most critically acclaimed and influential multiplayer maps, and played a significant role in the machinima series Red vs. Blue.