9781422286166

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Northwest: Idaho, Oregon, Washington

Craters of the Moon National Monument in southeastern Idaho presents a rocky landscape of lava flows, cinder cones, and sagebrush. The unusual terrain was formed by eight volcanic eruptions between 15,000 and 2,000 years ago. Today, the Craters of the Moon lava field covers 618 square miles (1,600 square km).

Rafters set out on a trip through the Snake River Canyon near Twin Falls. The canyon is 50 miles (81 km) long, with walls rising as high as 500 feet (150 meters).