The Underbog is the second 5-man wing of the Coilfang Reservoir, located in Zangarmarsh. The only Naga presence in this section defends the structure they built to house their hydra god, Ghaz'an.

Killing mobs and bosses grant Cenarion Expedition reputation, capped to Honored in normal mode. This is also a good source for Sporeggar reputation: it gives reputation through Exalted in normal mode and an NPC is at the entrance for repeatable Sanguine Hibiscus turn-ins.