The geography of Saskatchewan is unique among the provinces and territories of Canada in some respects. It is one of only two landlocked regions (Alberta is the other) and it is the only region whose borders are not based on natural features like lakes, rivers, or drainage divides. The borders of Saskatchewan, which make it very nearly a trapezoid, were determined in 1905 when it became a Canadian province. Saskatchewan has a total area of 651,036 square kilometres (251,366 sq mi) of which 591,670 km2 (228,450 sq mi) is land and 59,366 km2 (22,921 sq mi) is water.