Group 15A is located on an artificial platform formed by levelling a natural elevation. The castle caps Vista Rock, a outcropping of schist and the park's second-highest natural elevation. The results show that the citadel interior was probably located on a natural elevation. Maca can be cultivated beyond its natural elevation range, over above sea level. The highest natural elevation in Lengshuijiang is at Zushiling Ridge (). The highest natural elevation in Hunan is at Ling Peak (). The highest natural elevation in Ningxiang County is 1071m at Wazizhai (). Wayne County includes Indiana's highest natural elevation, Hoosier Hill, at 1,257 feet (383 m).