Get Chilled! Take a Dip in the World's Largest Lake!

Isle Royale National Park 

What Makes Lake Superior so Great?

Aerial View of Isle Royale, looking west
Looking west at Isle Royale from the air

NPS Photo/Paul Brown

  • Surface Area:  438,008 acres large, making it roughly the size of the State of Maine, in addition to being the largest lake by surface area in the world.
  • Volume:  Roughly 3-quadrillion gallons, which is enough water to cover both North and South America in one foot of water. 
  • Environment:  Remarkably cold and clean, it holds 10% of the world’s fresh surface water that is not frozen in a glacier or ice cap.

How can you celebrate the greatest of the Great Lakes during a visit to Isle Royale?  Take a dip in it!  Whether it is jumping off a dock or wading out into one of Isle Royale’s many bays, countless brave souls have plunged into the chilly, clear waters of Lake Superior (average temperature 40° Fahrenheit).  Visitors during the summer months will find warmer surface water temperatures in protected harbors and bays.