Back of card: Great Salt Lake, 18 miles west of Salt Lake CIty, Utah, is an inland sea covering an area of 2,000 square miles - 75 miles long with a maximum width of 50 miles. It contains a higher percentage (21%) of common salt than any other large body of water in the world. bathers enjoy the exhilarating experience of swimming in its water, so buoyant that it is impossible to sink. Saltair is a unique pleasure resort built on the shore of the lake. Its dance pavilion is one of the largest in the world.