A province located in the central part of Canada. Ontario is bordered by the provinces of Manitoba to the west, Quebec to the east, and the States of Michigan, New York, and Minnesota. Most of Ontario's borders with the United States are natural, starting at the Lake of the Woods and continuing through the four Great Lakes: Superior, Huron (which includes Georgian Bay), Erie, and Ontario (for which the province is named), then along the Saint Lawrence River near Cornwall. Ontario is the only Canadian Province that borders the Great Lakes. There are three different types of census divisions: single-tier municipalities, upper-tier municipalities (which can be regional municipalities or counties) and districts.