Inlet, Lake Huron , southeastern Ontario, Canada.
Sheltered from the rest of the lake by Manitoulin Island and the Bruce Peninsula, it is 120 mi (190 km) long and 50 mi (80 km) wide; its maximum depth is 540 ft (165 m). The Georgian Bay Islands National Park, established in 1929, comprises some 40 islands in the southeastern and western parts of the bay. The Thirty Thousand Islands along the bay's eastern shore constitute a popular summer resort area.