Swamp of Secrets

The Swamp of Secrets was the swamp at the floor of Karda Nui.

Before the Great Cataclysm, the swamp was no more than a sand pit. When Voya Nui split off from the Southern Continent, the sea water from the surface flowed in as a waterfall, forming a swamp. When the Stone Cord connecting Voya Nui and Mahri Nui was destroyed, Voya Nui fell back into place and the Staff of Artakha filled the hole Voya Nui created, cutting off the water from Karda Nui. The swamp was destroyed after the Energy Storms ravaged Karda Nui once again.

The Makuta who went there were Krika, Gorast, and Bitil. Half of the Toa Nuva also went to the swamp: Tahu, Gali, and Onua. The Toa Nuva and Makuta in the skies of Karda Nui later flew down to their brethren below, and Takanuva later showed up from an alternate universe. Its features included loads of mist, plants, and the Codrex. It was home to a host of different mutant Rahi, who were later killed in the Energy Storms.