The Sibley Peninsula is a 52-kilometre (32 mi) long and 10-kilometre (6 mi) wide peninsula in Ontario, Canada, on Lake Superior. It projects into the lake from Superior's north shore, and separates Thunder Bay to the west from Black Bay to the east. Sleeping Giant Provincial Park occupies most of the peninsula, while the actual Sleeping Giant rock formation, which resembles a human figure lying on its back, forms the southernmost extension of the peninsula. Twenty native fish species are known from lakes within the park.