The Great Lakes are a collection of five freshwater lakes located in northeastern North America along the Canada-US border. They include Lakes Superior, Michigan, Huron, Erie, and Ontario and cover an area of over 208,000 square kilometers. Indigenous peoples like the Iroquois, Algonquian, and others lived around the lakes before European settlement. The first European to explore the lakes was the French explorer Sieur de la Salle in 1679. The Great Lakes contain 21% of the world's surface fresh water and are home to over 35,000 islands. Major cities like Chicago, Detroit, and Toronto line their shores.