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Thunder Bay
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Thunder Bay

bay, Ontario, Canada
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Thunder Bay, inlet of northwestern Lake Superior, indenting the coast of west-central Ontario, Canada. The bay is 35 miles (55 km) long and 15 miles (24 km) wide; it receives the Kaministiquia and Current rivers. Pie Island lies at the entrance to the bay, and Sibley Provincial Park, 94 square miles (243 square km), is located on the peninsula that forms the bay’s eastern shore. The important port city of Thunder Bay is situated on the western shore.