Simple Definition of Thunder Bay
: city in Ontario, Canada
Full Definition of Thunder Bay
city Canada in SW Ontario on Lake Superior, formed 1970 by consolidation of Fort William & Port Arthur pop 108,359
Learn More about thunder bay
Britannica.com: Encyclopedia article about Thunder Bay
Seen and Heard
What made you want to look up Thunder Bay? Please tell us where you read or heard it (including the quote, if possible).