The Far Horizons is a 1955 American western film directed by Rudolph Maté, starring Fred MacMurray, Charlton Heston, Donna Reed and Barbara Hale. It is about an expedition led by Lewis and Clark is sent to survey the territory that the United States has just acquired in the Louisiana Purchase from France. They are able to overcome the dangers they encounter along the way with the help of a Shoshone woman named Sacagawea.