Why is Lake Ontario so deep?

The boundaries of Glacial Lake Ontario / Lake Iroquois extended beyond today's Lake Ontario shoreline. The ridge/hill on the south side of Casa Loma (for those who know Toronto) was the edge of Glacial Lake Ontario. The glacier was so heavy, it compressed the land underneath. read more

Lake Ontario is not so different in terms of depth from Lakes Huron or Michigan. It is significantly shallower than Lake Superior. Lake Erie is the outlier, being much shallower than the other Great Lakes. read more

Lake Ontario is one of the five Great Lakes of North America. It is surrounded on the north, west, and southwest by the Canadian province of Ontario, and on the south and east by the American state of New York, whose water boundaries meet in the middle of the lake. read more

The Great Lakes of North America, which span 750 miles from east to west, form the largest fresh water system on Earth. Here are 10 facts about Superior, Michigan, Huron, Erie, and Ontario. 1. read more