The largest Devils Lake is in Lenawee County on the boundary between Woodstock Township and Rollin Township.

The community of Devils Lake is on the northern end of the lake and Manitou Beach is at the southwest end.

The lake drains into Bean Creek on the southwest, just north of Manitou Beach.

Bean Creek flows into the village of Addison about two miles (3 km) to the west and continuing south, ultimately turns into the Tiffin River after crossing the Ohio state line.

In Alpena County, Devils Lake is a long and shallow marl and muck-bottomed lake on the North Branch of the Devils River within the Alpena State Forest.