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.