Long Lake is a large lake in the Lower Peninsula of the U.S. state of Michigan. Located about 6 miles (9.7 km) west of Traverse City, Long Lake is the largest lake in Grand Traverse County, and the 30th-largest inland lake in Michigan by surface area. Its maximum depth of 70 feet (21 m) makes it the fifth-deepest lake in Grand Traverse County. Long Lake is home to the largest nesting population of loons in the Lower Peninsula.

Grand Traverse County is a county located in the U.S. state of Michigan. As of the 2020 census, the population was 95,238, making it the largest county in Northern Michigan. Its county seat is Traverse City. The county is part of the Traverse City metropolitan area, which also includes neighboring Benzie, Kalkaska, and Leelanau counties.