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Thunder Bay is the most populous municipality in Northwestern Ontario.

• Thunder Bay is about 1000 km west of Sudbury and 500 km east of Kenora.
• Thunder Bay is the largest city in northwestern Ontario, and a cultural centre for northern Ontario.
• About 123,258 people live in Thunder Bay as of 2021.

Thunder Bay is sometimes called the "Lakehead" because it is at the head of the Great Lakes. It is also home to Lakehead University. Thunder Bay is located on Lake Superior, and is surrounded by parks and wilderness areas.

Major industries in Thunder Bay include transportation, manufacturing, education, mining and forestry.