Lake Ontario is the easternmost of the Great Lakes and the smallest in surface area (7,340 sq mi, 19,000 km ), although it exceeds Lake Erie in … See more

The lake has a natural seiche rhythm of eleven minutes. The seiche effect normally is only about 3⁄4 inch (1.9 cm) but can be greatly amplified by … See more

The name Ontario is derived from the Huron word Ontarí'io, which means "great lake". In Colonial times, the lake was also called Cataraqui, a … See more

Lake Ontario is the site of several major commercial ports including the Port of Toronto and the Port of Hamilton. Hamilton Harbour See more

The lake basin was carved out of soft, weak Silurian-age rocks by the Wisconsin ice sheet during the last ice age. The action of the ice occurred along the pre-glacial See more

The Great Lakes watershed is a region of high biodiversity, and Lake Ontario is important for its diversity of birds, fish, reptiles, amphibians, and plants. Many of these special … See more

A large conurbation called the Golden Horseshoe occupies the lake's westernmost shores, anchored by the cities of Toronto and Hamilton. Ports on the Canadian side include St. Catharines, Oshawa, Cobourg and Kingston, near the St. Lawrence River … See more