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permafrost

(Encyclopedia)permafrost, permanently frozen soil, subsoil, or other deposit, characteristic of arctic and some subarctic regions; similar conditions are also found at very high altitudes in mountain ranges. In 196...

Hubbard Glacier

(Encyclopedia)Hubbard Glacier, SE Alaska, largest tidewater glacier in North America, on Disenchantment Bay at head of Yakutat Bay, at the northern end of the Alaskan panhandle. Extending 76 mi (122 km) from Mt. Lo...

Chukchi Sea

(Encyclopedia)Chukchi Sea chəkˈchē [key], part of the Arctic Ocean N of the Bering Strait, between Siberia and Alaska, Wrangell Island lies to the west and the Beaufort Sea lies to the east. The sea has an appro...

Porcupine, river, Canada

(Encyclopedia)Porcupine pôrˈkyəpīnˌ [key], river, 448 mi (721 km) long, rising in the Ogilvie Mts., NW Yukon, Canada. It flows in a great arc NE through the Eagle Plain, then W into Alaska and to the Yukon Riv...

Trans-Canada Highway

(Encyclopedia)Trans-Canada Highway, c.4,800 mi (7,700 km) long, S Canada; dedicated 1962; completed 1970. The world's longest national highway, it traverses North America from St. John's, N.L., to Victoria, British...

White Pass

(Encyclopedia)White Pass, 2,888 ft (880 m) high, in the Coast Mts., on the Alaska–British Columbia border, NE of Skagway. A hazardous trail through the pass was made (1897) by prospectors going to the Klondike, a...

Logan, Mount

(Encyclopedia)Logan, Mount, 19,551 ft (5,959 m) high, in Kluane National Park, extreme SW Yukon, Canada, just E of Alaska; highest mountain in Canada and second highest in North America. One of the St. Elias Mts., ...

Colville, river, United States

(Encyclopedia)Colville, river, c.375 mi (600 km) long, rising in the De Long Mts. of the Brooks Range, NW Alaska, and flowing across the tundra, east then north, to the Arctic Ocean. All of its major tributaries ri...

Nordenskjöld, Nils Otto Gustaf

(Encyclopedia)Nordenskjöld, Nils Otto Gustaf, 1869–1928, Swedish geographer and explorer, nephew of Nils Adolf Erik Nordenskjöld. He headed an expedition to Patagonia (1895–97) and later explored the Klondike...

Whitney, Mount

(Encyclopedia)Whitney, Mount, peak, 14,494 ft (4,418 m) high, E Calif., in the Sierra Nevada at the eastern border of Sequoia National Park; the highest peak in the contiguous 48 states (Denali [Mt. McKinley], Alas...