The Slate Islands are a small archipelago in Lake Superior, Ontario, Canada, about 12 kilometres (7.5 mi) south of the town of Terrace Bay. The island group, consisting of 15 islands in total, was created by a meteorite impact which formed a crater about 32 km (20 mi) wide. In 1985, the Ontario government established the Slate Islands as a natural environment provincial park. The islands are notable for having Ontario's largest herd of boreal woodland caribou.

Terrace Bay is a township in Thunder Bay District in northern Ontario, Canada, located on the north shore of Lake Superior east of Thunder Bay along Highway 17. The name originates from a series of lake terraces formed as the water level in Lake Superior lowered following the latest ice age.