The Quagmire is the seventh and final area of Isle O' Hags in Banjo-Tooie. It can be first accessed from Wasteland by using Springy Step Shoes. Quagmire contains the entrances to two worlds, Grunty Industries and Cauldron Keep.
The largest feature of the area is an elevated, apparently inaccessible rail bridge (possibly for Chuffy). There is also grounded pipeline that runs of from the left side of the area (with respect to the passageway from Wasteland) to the right side and up the wall presumably to Cauldron Keep. The only other feature is two large pools of purple toxic waste highly populated by Dragunda.
The pipeline also features a lengthy Claw Clamber Boots track from one end of the pipeline to the other. By using the Claw Clamber Boots found on the left hand end and following the track all the way to the right hand end, the entrance the final world can be reached. (A Shock Jump Pad can be activated to ease access to the entrance for later.)