Lake Ogre-Chobee is in southern Xanth. It was the home of ogres until the curse fiends drove them out. Under the surface is Gateway Castle, home of the curse fiends. It is inhabited by part of its namesake, chobees. In the center of the lake is a great vortex.
Near the northern border, east of the Swan Knee River lies the Ogre-Fen-Ogre Fen, the location where Ogres settled after migrating away from Lake Ogre-chobee in the south