. . . "The lake was formed by water that had seeped through the rock forming a cave. The residue of the sedimentary rock washed down to the bottom. It was wide, deep, and piercingly cold, yet fish somehow lived in it. The lake also has an outlet to the outside via an underground stream."@en . "Gollum's lake"@en . . "The lake was formed by water that had seeped through the rock forming a cave. The residue of the sedimentary rock washed down to the bottom. It was wide, deep, and piercingly cold, yet fish somehow lived in it. The lake also has an outlet to the outside via an underground stream."@en .