Lake Erie is the fourth largest of North America's five Great Lakes by surface area and the southernmost, shallowest, and smallest by volume. It was carved by receding glaciers of the Great Ice Age approximately 4,000 years ago and was named for the Erie tribe of Native Americans who lived along its southern shore. The shallowest of the Great Lakes, it contains 128 trillion gallons of water and measures 241 miles long and 57 miles wide. Eighty percent of its water flows in through the Detroit River from Lakes Superior, Huron, and Michigan. It provides drinking water for approximately 11 million people, and its microclimates and formerly more extensive lakebed support agriculture, making the north shore one of Canada's richest fruit and vegetable regions, the southeastern shore an important grape-growing region, and the lake's shores from Ohio to New York abundant with apple orchards.