Caribou Island is an uninhabited island in Lake Superior, approximately 1.5 kilometres (0.93 mi) south of the township of Shuniah, Ontario and approximately 32 kilometres (20 mi) east of the city of Thunder Bay. It is approximately 3.3 kilometres (2.1 mi) long and 0.7 kilometres (0.43 mi) wide, and 371 acres (150 ha) in area. The north shore of the island features steep cliffs leading to an elevated plateau. Atop the plateau lies a small kettle lake.