The regional designations vary widely within the Canadian province of Saskatchewan. With a total land area of 651,036 square kilometres (251,366 sq mi), Saskatchewan is crossed by major rivers such as the Churchill and Saskatchewan and exists mostly within the Hudsons Bay drainage area. Its borders were set at its entry into Confederation in 1905, and Saskatchewan is one of only two landlocked provinces (the other is Alberta) and the only province whose borders are not based on natural features.