This map shows the location of the Cordilleran physiographic region. The Cordilleran Region is divided into three large linear zones called the Eastern System, the Interior System and the Western System. Each system is further divided into areas and subdivided into mountains, ranges, plateaus, hills, valleys, trenches, basins and plains. Each has its own geological and physiographic characteristics. The Cordillera is also divided transversely into a number of segments by east-west belts of relatively low terrain.