Amann Reservoir is located in Morrow County just west of OH-309 and OH-61. It is approximately 60 miles north of Columbus and 20 miles west of Mansfield.

There is access from OH-309 to both the north and south sides of this reservoir. The north side has a picnic area. The south access road provides access to both the Amann and Amick Reservoirs.

The Amick Reservoir is adjacent, south of Amann Reservoir.