Wisconsin is a terrific place for wild swimming and cold-water plunging. Here's how a typical summer pastime has become my obsession.

Together, they form the largest group of freshwater lakes globally, holding 20% of the Earth's surface freshwater and stretching across eight states, including Michigan, Wisconsin and New York.

Minnesota and Wisconsin are in contention. Minnesota is well known for being the 'Land of 10,000 Lakes.' Wisconsin is saying it has more.