 The Platte River rises out of a lake district around Lake Ann in the northeast of the county and flows southwest and the northwest into Big Platte Lake before emptying into Lake Michigan at Platte River Point.The Betsie River rises in neighboring Grand Traverse County, flowing southwest across the southeast corner of the county into Manistee County, where it bends northwest until just south of Benzonia where it receives the outflow of Crystal Lake and then flows mostly west through Elberta and Frankfort and into Lake Michigan.Portions of the Pere Marquette State Forest lie within the county and offer several trails including a route along the Betsie River and a trail near Lake Ann.