Sailboats, Lake Minnetonka, Minnesota, 1975 (Photograph by David Boyer)
Sailboats jockey for position in a boat race on Lake Minnetonka in Minnesota, a state that owes much of its buoyant outdoor spirit to its rivers and 15, 291 lakes. For a lake to be counted, it has to cover at least ten acres (four hectares) and flow with fresh water. No ponds or potholes, please.
(Text adapted from and photo shot on assignment for, but not published in, "Minnesota, Where Water Is the Magic Word," February 1976, National Geographic magazine)