The Swamp of Disillusionment is a swamp located in close proximity to the Valley of Peace.
In "Wake Me Up Before You Po-Po!", the Crocodile Army of General Rong infiltrates the swamp in order to pump the Mist of Morpheus into the air of the valley in an effort to put all its inhabitants to sleep. Confident that they had succeeded, the army marched from the swamp while leaving one of their men behind to continue pumping the mist. However, the Furious Five and Po discovered the Crocs' plans and subdued the last soldier, stopping the pump before pursuing Rong and his army.