From PathfinderWiki

Evergrowth is a natural wonder and a naturalist's dream: a verdant swampland filled with a diversity of plant life not found anywhere else in Katapesh.

Evergrowth is covered in a canopy of verdant green growth shot through with beams of sunlight. It teems with life, and is filled with a wide variety of insects, reptiles, birds, and small mammals. This abundance has also drawn fierce creatures that prey on this life, like gnolls and Katapesh's only kobolds, to live in Evergrowth. Despite these dangers, there are no end to the people willing to venture into the swamp to find rare herbs and plants.1