Alaska (ulă'sku) [key], largest in area of the United States but third smallest (exceeding only Vermont and Wyoming) in population, occupying the northwest extremity of the North American continent, separated from the coterminous United States by W Canada. It is bordered by Yukon Territory and British Columbia (E), the Gulf of Alaska and the Pacific Ocean (S), the Bering Sea, Bering Strait, and Chukchi Sea (W), and the Beaufort Sea and the Arctic Ocean (N).