Crater Lake National Park
Crater Lake National Park
Credit: Mike Doukas of the USGS

Crater Lake National Park in Southern Oregon is Oregon's only national park. Its primary feature is Crater Lake. The park was established on May 22, 1902, as the fifth National Park in the U.S. The park encompasses Crater Lake's caldera, which rests in the remains of a destroyed volcano posthumously called Mount Mazama.