Minnesota, Land of 10,000 lakes(and many more).

Minnesota is  known as The Land of 10,000 Lakes. Actually, according the official count, there are over 11,000 lakes. Basically, Minnesota's geography gives lends its nickname. Geography is also the determining factor for how Minnesota got its name. Minnesota's name comes from the Dakota word meaning "land of sky-tinted waters", referring to the lakes. 

In short, if you want to go fishing, Minnesota would be a great place to do, with ample fishing opportunities everywhere. 

               Lake Vermilion in Saint Louis County,Minnesota. Source: Star-Tribune

How Minnesota got those lakes has everything to do with geology. Much of Canada and the Midwestern USA had been covered in an ice sheet 1 million years ago. It was the Last Ice Age, however, that would be a major influence on Minnesota's geography. The constant movement of glaciers, scraping at the soil and rocks, and the glaciers retreating and melting, this helped to form the lakes in Minnesota. 

                  Map of North American glaciation, Shane A. Lyle Kansas Geological Survey

And that is how we have the Land of 10,000(and many more) Lakes.