Narrower Terms (15)

• Credit River Valley (Ont.)
• Detroit River Valley (Mich. and Ont.)
• Don River Valley (Ont.)
• Grand River Valley (Ont.)
• Humber River Valley (Ont.)
• Mississippi River Valley (Ont.)
• Niagara River Valley (N.Y. and Ont.)
• Ogoki River Valley (Ont.)
• Ottawa River Valley (Québec and Ont.)
• Rainy River Valley (Minn. and Ont.)
• Saint Clair River Valley (Mich. and Ont.)
• Saint Marys River Valley (Mich. and Ont.)
• Thames River Valley (Ont.)
• Trent River Valley (Ont.)
• Winnipeg River Valley (Ont. and Man.)