Highland Rim - Geology and Physiography

Geology and Physiography

The Highland Rim is a physiographic section of the larger Interior Low Plateaus province, which in turn is part of the larger Interior Plains physiographic division. Most of the Highland Rim is located in U.S. EPA Ecoregion 71, Interior Plateau, which is a part of the Eastern Temperate Forest,

The sections of the Rim are referred to the four cardinal directions, e.g., "Northern Highland Rim", etc. It should be recognized that the Rim is rather continuous and any division of it, including the ones made below, are somewhat arbitrary. The term "Highland" here is relative: it is certainly higher than the Basin it surrounds, but it nonetheless is seldom at an elevation above 1,100 feet (340 m) above sea level, and never more than about 1,400 feet (430 m) above sea level except where interrupted, primarily to the southeast, by outliers of the Cumberland Plateau. With the exception of a few broad stream bottoms, the land is characterized by ridges and valleys with a few fairly low hills. The entire region is well watered with many perennial streams, and occasional waterfalls which sometimes delineate the Rim from the Basin which it surrounds.