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Glen Canyon National Recreation Area - Arizona and Utah

The Glen Canyon National Recreation Area covers over 1.2 million acres of rugged terrain, extending from the lower Cataract Canyon in Utah to the northern reaches of Arizona. It features the second-largest man-made lake in the United States, with stunning cliffs, gorges, and scenic drives to enjoy. Considered one of the best places to boat, few visitors leave disappointed—if they can avoid the hazards of the area. The rugged terrain and extreme desert climate pose risks to visitors, and as a result, the park has experienced several losses, injuries, and fatalities. There are also flash floods and an absence of lifeguards.

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Based on the number of search and rescues carried out, Glen Canyon National Recreation Area is considered one of the riskiest national parks out there.