Hells Canyon is a ten-mile-wide (16 km) canyon in the Western United States, located along the border of eastern Oregon, western Idaho, and a small section of eastern Washington. It is part of the Hells Canyon National Recreation Area which is also located in part of the Wallowa-Whitman National Forest. It is North America's deepest river gorge at 7,993 feet (2,436 m), running deeper than the Grand Canyon in Arizona.

Idaho is a landlocked state in the Mountain West subregion of the United States. It shares a small portion of the Canada–United States border to the north, with the province of British Columbia. It borders Montana and Wyoming to the east, Nevada and Utah to the south, and Washington and Oregon to the west. The state's capital and largest city is Boise. With an area of 83,569 square miles (216,440 km2), Idaho is the 14th largest state by land area. With a population of approximately 1.8 million, it ranks as the 13th least populous and the 7th least densely populated of the 50 U.S. states.