The Thunder Bay River is a 75.4-mile-long (121.3 km) river in the U.S. state of Michigan. It drains much of Alpena County and Montmorency County, and a small portion of Oscoda County, into Thunder Bay, a bay of Lake Huron, on the eastern side of northern Michigan. The mouth of the river is in the heart of downtown Alpena and is guarded by the Alpena Light Station.

Quelle: Wikipedia