Georgia is defined by a diversity of landscapes, flora, and fauna. The state's northernmost regions include the Blue Ridge Mountains, part of the larger Appalachian Mountain system. The Piedmont plateau extends from the foothills of the Blue Ridge south to the Fall Kine, an escarpment to the coastal plain defining the state's southern region. Georgia's highest point is Basstown bald at 4,784 feet (1,458 m) above sea level; the lowest is the Atlantic Ocean. With the exception of some high-altitude areas in the Blue Ridge, the entirety of the state has a humid subtropical climate. Of the states entirely east of the Mississippi River, Georgia is the largest in land area.