The Mississinawa Moraine begins in Ohio east of Lima in Hardin County, then running in a shallow arc to the south of Grand Lake St. Marys and St. Marys in Mercer County towards Fort Recovery, Ohio.
Just west of Fort Recovery, the moraine again arches southward towards the Mississinewa River.
The southern arm runs to the southeast from the Wabash along the northern shore of the Mississinewa River from which it takes its name.
Running parallel, the Mississinewa is renamed as the Broadway and Powel moraines in Hardin County.
[2] Soil borings used in the investigation Mississinewa moraine and drift located a preglacial valley in Grant and Jay Counties in Indiana.
The two moraines merge near Spring Arbor, about 10 miles (16 km) west of Jacksonat the edge of Washtenaw County.