Great Salt Lake, located in the northern part of the U.S. state of Utah, is the largest salt lake in the Western Hemisphere, the fourth largest terminal lake in the world, and the 33rd largest lake on Earth. In an average year the lake covers an area of around 1,700 square miles (4,400 km²), but the lake's size fluctuates substantially due to its shallowness. For instance, in 1963 it reached its lowest recorded level at 950 square miles (1,529 km²), but in 1987 the surface area was at the historic high of 3,300 square miles(5,311 km²).