Lake Powell

Lake Powell is located in northern Arizona and stretches up into southern Utah. It's part of the Colorado River in Glen Canyon National Recreation Area.
Lake Powell is 186 miles long and has 1,960 miles of shoreline.
There are 96 major canyons to explore though you'll need a water craft .

Activities include swimming, fishing, scuba diving, snorkeling, water skiing, hiking and sightseeing.

Coordinates: 36°56′10″N 111°29′03″W