The Great Lakes are a group of five lakes located on the border between the United States and Canada (Lake Superior, Lake Michigan, Lake Huron, Lake Erie, and Lake Ontario). They are the largest group of freshwater lakes in the world; they are also considered as closed seas. They cover a total of 245,100 km², an area similar to that of the United Kingdom, irrigating an area of 521,830 km² and with 22,671 km³ of stored water, they contain 21% of the world’s fresh water.
They began to form at the end of the last ice age around 14,000 years ago, as the melting ice caps carved basins into the land and filled them with meltwater. Lakes have been an important avenue for transportation, migration, and trade, and it is home to a large number of species.
Lake Huron is the second largest. Including the bays of Georgia and Saginaw, it occupies an area of 59,570 km², of which 36,001 km² belong to Canada. The lake basin occupies about 134,000 km2. It has a maximum length and width of 332 and 295 km, respectively. Its maximum depth is 229 meters. Its surface is located at 176 meters above sea level.