Great Lakes

The Great Lakes are a series of five large interconnected freshwater lakes spanning the Canada-United States border, consisting of Superior, Michigan, Huron, Erie, and Ontario. They contain 21% of the world's surface freshwater by volume and are the largest group of freshwater lakes on Earth by total area. The lakes began to form around 14,000 years ago and have been a major source for transportation, migration, trade, and fishing, serving as a habitat to many aquatic species in a region with much biodiversity.learn more on wikipedia