 The continental divide provides a separation point for water in the United States. In most cases, if the precipitation falls on the western side, it begins its journey to the Pacific Ocean. If it falls on the eastern side, it travels to the Atlantic Ocean. However, in Wyoming's Great Divide Basin, the precipitation does not have the same fate. This precipitation falls in a closed basin where it does not reach either ocean and only leaves through evaporation. The Great Divide Basin encompasses a good bit of the driest part of Wyoming, the Red Desert. This area receives about 8 inches of precipitation per year and is characterized by ephemeral streams and permanent and plia lakes. It is home to vegetation that is drought tolerant because it has to take advantage of the water when it becomes available. Wildlife and livestock also receive the full benefit of this limited precipitation. The Great Divide Basin encompasses 3,900 square miles. The continental divide splits at South Pass and becomes a single divide again at Historic Bridger Pass, approximately 20 miles southwest of Rollins. Making a deposit in Wyoming's Great Divide Basin from the University of Wyoming Cooperative Extension Service, I'm Mae Smith, Exploring the Nature of Wyoming.