Gates of the Arctic National Park and Preserve is an American national park that protects portions of the Brooks Range in northern Alaska. The park is the northernmost national park in the United States, situated entirely north of the Arctic Circle. The area of the park and preserve is the second largest in the U.S. at 8,472,506 acres ; the National Park portion is the second largest in the U.S., after the National Park portion of Wrangell–St. Elias National Park and Preserve.
Oolah Valley in the Itkillik Preserve
Hikers in the Itkillik River drainage, a group of tilted sedimentary peaks in the central Brooks Range
Visitors camping in the Thunder Valley of the Brooks Range in the Gates of the Arctic National Park and Preserve.
Group of hikers overlooking a glacier in the Gates of the Arctic National Park and Preserve.
Koyukuk River
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The Koyukuk River is a 425-mile (684 km) tributary of the Yukon River, in the U.S. state of Alaska. It is the last major tributary entering the Yukon before the larger river empties into the Bering Sea.
Flowing through the Kanuti National Wildlife Refuge
Lower course of the Koyukuk in winter
Zane Hills and Koyukuk River