The area of Hells Canyon National Recreation Area is 2,640.525 square kilometers.
Hells Canyon National Recreation Area was created on 1975-12-31.
The deepest gorge in Idaho is called Hells Canyon. The canyon is part of Hells Canyon National Recreation Area, and is North America's deepest river gorge.
Glen Canyon National Recreation Area was created on 1972-10-27.
Bighorn Canyon National Recreation Area was created on 1966-10-15.
Hells Canyon National Recreation Area is not within Crater Lake National Park. Indeed, that Canyon is not even administered by the National Parks Service; it's part of the National Forest Service. By road, the two are about 400 miles apart.
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Montana and Wyoming.
Thomas Keith Larson has written: 'Visitor perceptions of the Hells Canyon National Recreation Area' -- subject- s -: Outdoor recreation, Psychological aspects, Psychological aspects of Outdoor recreation, Psychological aspects of Wild and scenic rivers, Recreational surveys, Recreational use, Wild and scenic rivers
Hell's Canyon is a gorge of the Snake River, forming part of the Idaho-Oregon boundary. It is 125 miles long, and for 40 miles it is more than a mile deep. A maximum depth of 7,900 feet (2,400 m) makes it the deepest gorge in North America. Along with its surrounding area of 662,000 acres, Hells Canyon was designated a national recreation area in 1975.
The area of Moosalamoo National Recreation Area is 64.244 square kilometers.
The area of Allegheny National Recreation Area is 81.552 square kilometers.
The area of Chickasaw National Recreation Area is 40.019 square kilometers.