Brooks Range, mountain chain, northernmost part of the Rocky Mts., extending about 600 mi (970 km) from east to west across N Alaska. Mt. Chamberlin, 9,020 ft (2,749 m) high, near the Canadian border, is the highest peak. Rugged, barren, snow-covered, and uninhabited, Brooks Range separates the oil-rich Arctic Ocean coastal plain from the Yukon River basin. An oil pipeline was built across the range in 1977; it begins at Prudhoe Bay in the north and extends to the port of Valdez, in S Alaska.

Mountain range, northern Alaska, U.S. It extends about 600 mi (1,000 km) from Kotzebue Sound to the Canadian border. Its highest peak is Mount Isto, at 9,060 ft (2,760 m). Forming the northwestern end of the Rocky Mountains, it lies within Gates of the Arctic National Park. Huge reserves of oil were discovered at Prudhoe Bay, and the range is crossed at Atigun Pass by the Trans-Alaska Pipeline.

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