Gollum's lake

Gollum's lake was the lake in Gollum's cave.

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.

Gollum lived off of the lake and the fish that lived in it, by which he paddled a homemade boat back and forth between the lake and a small island at the center of the lake, which was also Gollum’s home.