low mountains extending for 200 miles (320 km) from east-central Western Australia southeast to the southwest corner of Northern Territory. A continuation of the granite and gneiss formations in the Musgrave Ranges to the southeast, the Petermanns rise to a height of 3,800 feet (1,158 metres). Visited (1874) by Ernest Giles, the mountains were named after August Petermann, a German geographer. The eastern section lies within the Petermann Aboriginal Land Trust's territory. To the east are Ayres Rock (now more commonly called Uluru, its Aboriginal name) and the Olgas (Kata Tjuta) rock formations; both are part of Uluru-Kata Tjuta National Park, designated a UNESCO World Heritage site in 1987 (extended 1994).