As the name suggests, it is a large, poisonous bog. The bogs are filled with acid lakes, which can easily burn through wood. The ground is muddy, and there are many trees and vines growing on the various islands in the bogs.
The bogs are also the location of the Venomari Tomb.
Various species of animals live in the bogs, some of which are Bogmollerworms, Purple Bog Frogs, and Yellow Overbloops.
A rare fruit known as the Inky Lemonberry grows in a clearing in the bogs which can be used to make the Tea of Insight.