The Maumee River is a river in northwestern Ohio and northeastern Indiana in the United States. It is formed at Fort Wayne, Indiana by the confluence of the St. Joseph and St. Marys rivers, and meanders northeastwardly for 137 miles (220 km) through an agricultural region of glacial moraines before flowing into the Maumee Bay of Lake Erie at the city of Toledo, Ohio.It was designated an Ohio State Scenic River on July 18, 1974.
The watershed of the Maumee River was a large wetlands known as the Great Black Swamp. In the nineteenth century, settlers struggled to drain it to convert the fertile land to farmland, altering an important habitat for migrating birds and a variety of wildlife. The wetlands was the remains of Glacial Lake Maumee, the proglacial ancestor of Lake Erie.
The Maumee has the largest watershed of any Great Lakes river with 8,316 square miles (21,540 km2). Its watershed includes a portion of southern Michigan. In addition to its source tributaries the St. Joseph and St. Marys rivers, the Maumee's principal tributaries are the Auglaize River and the Tiffin River, which join it at Defiance from the south and north, respectively.
According to the Ohio Department of Natural Resources, the annual walleye run up the Maumee River is one of the largest migrations of riverbound walleyes east of the Mississippi. The migration of the walleye normally starts in early March and runs through the end of April.The most popular method of fishing for the migrating walleye is by wading out into the river and casting.