Thunder BayThun·der Bay
city & port in W Ontario, Canada, on Lake Superior: formed in 1970 by the merger of Fort William and Port Arthur
Origin of Thunder Bayafter the bay on which it is located: the bay was named for the thunderbird of Indian legend
A city of southwest Ontario, Canada, on Thunder Bay, an inlet on the northwest shore of Lake Superior. A major port and industrial center, it was created in 1970 by the amalgamation of the twin cities of Port Arthur and Fort William.
- a town in Ontario, Canada
- a large bay in Canada