Thunder Bay is a large bay on the north shore of Lake Superior

Lake Superior

Lake Superior is the largest of the five traditionally-demarcated Great Lakes of North America. It is bounded to the north by the Canadian province of Ontario and the U.S. state of Minnesota, and to the south by the U.S. states of Wisconsin and Michigan. It is the largest freshwater lake in the...

. The bay is about 50 km long and 22 km wide. It is bordered to the east by the Sibley Peninsula

Sibley Peninsula

The Sibley Peninsula is a long and wide peninsula in Ontario, Canada on Lake Superior. It projects into the lake from its north shore, and separates Thunder Bay to the west from Black Bay to the east....

 at the southern tip of which is Thunder Cape, marking the entrance to the bay for ships approaching from the east. The peninsula when viewed from the north shore of the lake has the appearance of a Sleeping Giant

Sleeping Giant (Ontario)

The Sleeping Giant is a formation of mesas and sills on Sibley Peninsula which resembles a giant lying on its back when viewed from the West to North-Northwest section of Thunder Bay, Ontario, Canada. As one moves southward along the shoreline toward Squaw Bay the Sleeping Giant starts to separate...

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Rivers emptying into the bay include the:

• Kaministiquia River
  Kaministiquia River
  The Kaministiquia River is a river which empties into western Lake Superior at the city of Thunder Bay, Ontario. Kaministiquia is an Ojibwe word meaning " with islands" due to two large islands at the mouth of the river...
  
  
• Neebing River
• McIntyre River
• Current River
  Current River (Ontario)
  The Current River is a river in Northwestern Ontario, Canada which empties into Lake Superior. It rises out of Current Lake, north west of the city of Thunder Bay, curves through a number of small lakes, including Onion Lake , before heading north to empty into Thunder Bay at the northern edge of...
  
  
• MacKenzie River (18 km east of the city)
• Blende River
• Wild Goose Creek
• Blind Creek

The harbour at Thunder Bay

Thunder Bay

-In Canada:Thunder Bay is the name of three places in the province of Ontario, Canada along Lake Superior:*Thunder Bay District, Ontario, a district in Northwestern Ontario*Thunder Bay, a city in Thunder Bay District*Thunder Bay, Unorganized, Ontario...

, Ontario

Ontario

Ontario is a province of Canada, located in east-central Canada. It is Canada's most populous province and second largest in total area. It is home to the nation's most populous city, Toronto, and the nation's capital, Ottawa....

 is Canada's westernmost port

Port

A port is a location on a coast or shore containing one or more harbors where ships can dock and transfer people or cargo to or from land....

 on the Great Lakes

Great Lakes

The Great Lakes are a collection of freshwater lakes located in northeastern North America, on the Canada – United States border. Consisting of Lakes Superior, Michigan, Huron, Erie, and Ontario, they form the largest group of freshwater lakes on Earth by total surface, coming in second by volume...

.

The Ojibwa

Ojibwa

The Ojibwe or Chippewa are among the largest groups of Native Americans–First Nations north of Mexico. They are divided between Canada and the United States. In Canada, they are the third-largest population among First Nations, surpassed only by Cree and Inuit...

called it "Animikie", meaning thunder. French explorers called it "Baie du Tonnerre" which was translated to Thunder Bay in English.