It is separated from the larger Lough Nacung Upper, to the west, by a narrow strip of land.

The Devlin River flows into the south-eastern end of the lough, on the southern edge of Dunlewey village.

There is a modern wooden sculpture of Lugh, an ancient Irish god, on the lakeshore.

[citation needed] On the lakeshore there is also tourist centre, called the Lakeside Centre or Ionad Cois Locha, which offers boat trips of the lake, and where they tell folk tales of a witch that is said to have lived in the big house in the forest across the lake.

This article related to the geography of County Donegal, Ireland is a stub.