The country is flat with little elevation, having an average height above sea level of . The highest natural point is Møllehøj, at . A sizeable portion of Denmark's terrain consists of rolling plains whilst the coastline is sandy, with large dunes in northern Jutland. Although once extensively forested, today Denmark largely consists of arable land. It is drained by a dozen or so rivers, and the most significant include the Gudenå, Odense, Skjern, Suså and Vidå—a river that flows along its southern border with Germany.