Lake Powell Recreation Area - 87 Miles

Encompassing over 1.2 million acres, Glen Canyon National Recreation Area (NRA) offers unparalleled opportunities for water-based & backcountry recreation. The recreation area stretches for hundreds of miles from Lees Ferry in Arizona to the Orange Cliffs of southern Utah, encompassing scenic vistas, geologic wonders, and a vast panorama of human history.

http://www.nps.gov/glca/