According to the United States Army Corps of Engineers,[1] Grand Lake is located in the extreme south-central part of the state about 12 miles (19 km) south of the town of Lake Arthur, Louisiana.

It is a large circular lake approximately 42,100 acres (170 km2) in size and is about 8.25 by 8.25 miles (13.28 by 13.28 km).

The lake is isolated from roads and highways and has no direct accesses.

It has to be accessed from the Intracoastal Waterway that goes across its northern extremity, from points around the town of Lake Arthur to the north or from the town of Grand Chenier to the south.

This Louisiana state location article is a stub.