While on sick leave on June 4, 1872, he discovered Elk Lake, adjoining Lake Itasca, in the Lake District of Northwestern Minnesota and declared it to be the source of the Mississippi River.
Modern explorers and geographers, however, have used the tiniest trickles of water to determine the source of the Amazon, Nile, and other rivers.
Salt Lake City | Swan Lake | Lake Superior | Lake Erie | Lake Michigan | Lake Placid, New York | Lake District | Lake Ontario | Lake Como | Emerson, Lake & Palmer | Lake Geneva | lake | Lake Tahoe | Lake Huron | Lake Constance | Lake Ladoga | Lake Victoria | Lake Placid | Lake Garda | Itasca County, Minnesota | Lake Onega | Lake | Itasca County | Silver Lake | Lake County | Lake County, Florida | Lake Biwa | Lake Turkana | Lake Lugano | Saranac Lake, New York |