Geography of Ontario
Physical geography
Ontario also shares borders with several U.S. states. From west to east, the Minnesota border consists of the Lake of the Woods, Rainy River, Rainy Lake and its tributaries. The border then includes the only 1 km of land of its entire 2,700 km U.S. border, the Height of Land Portage, which divides the Arctic Ocean and Nelson River watershed from that of the St Lawrence River and the Atlantic Ocean. The U.S./Minnesota border then follows tributaries of the Pigeon River to its mouth at Lake Superior. Ontario borders Michigan across Lake Superior, the Saint Mary's River, Lake Huron, the St. Clair River, Lake St. Clair, the Detroit River, and Lake Erie. The province also borders Ohio and Pennsylvania across Lake Erie. The 309 km boundary with New York includes Lake Ontario, the St. Lawrence and Niagara rivers.
Geography of Ontario-8