The Fau Swamp was a marshy area that extended through most of the jungle floor of Le-Wahi on the island of Mata Nui.
The Fau Swamp came into being when the Great Spirit Mata Nui's camouflage system was accidentally activated during the Great Cataclysm and created the island of Mata Nui. It was highly dangerous due to the number of dangerous Rahi and carnivorous plants that inhabited the swamp.
When the Toa Metru arrived on the island of Mata Nui to search for a refuge for the Matoran of Metru Nui, Matau got lost in the Fau Swamp. Seeing that the swamp was unsuitable for building a village upon, he resolved that the future village of Le-Koro would be located high in the treetops instead.
The Swamp was later destroyed when the Bohrok swarms were reawakened and cleansed the island of Mata Nui and the remains later wiped from existence completely by Mata Nui's awakening.
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