Peace River Valley (B.C. and Alta.) Merrimack River Valley (N.H. and Mass.) Hudson River Valley (N.Y. and N.J.) Okanagan River Valley (B.C. and Wash.) Shenandoah River Valley (Va. and W. Va.) Delaware River Valley (N.Y.-Del. and N.J.) Yukon River Valley (Yukon and Alaska) Ganges River Valley (India and Bangladesh)