Sejan lake

A view of the lake from the beach.

Location on the map.

There is a mostly empty and uninteresting lake on the Sejan peninsula. However, there is also a treasure chest sunk on the bottom of the lake, and Naigad is hanging around the lake to get the contents of it for herself. The player can also explore and swim around the lake freely, but they can't find the chest by themselves.

Curiously, the lake seems to be devoid of any forms of life outside of Naigad and the player skinny dipping in it.