Lake Powell, the second largest manmade lake in the US is located on the border of Utah and Arizona in Glen Canyon National Recreation Area, and offers nearly 2,000 miles of spectacular shoreline with toering red rock sandstone cliffs, more than 90 major canyons, blue-green water and sandy beaches. It's best viewed from the water and is an ideal family vacation in the summer as chronicled in Roger Cox' account of his Lake Powell.