Sand Mountain is a sandstone plateau in northeastern Alabama and (to a far lesser extent) northwestern Georgia. It is part of the southern tip of the Appalachian mountain chain. Geologically a continuation of Walden Ridge, Sand Mountain is part of the Cumberland Plateau, separated from the main portion of the plateau by the Tennessee River and Sequatchie Valley. The average elevation on Sand Mountain is around 1,500 feet (460 m) above sea level, compared to about 650 feet (200 m) in the surrounding area. This elevation leads to its having the coolest climate in the state of Alabama. The largest city on Sand Mountain is Albertville, in Marshall County.