Zhangzhung or Shangshung was an ancient kingdom in western and northwestern Tibet, which pre-dates the culture of Tibetan Buddhism in Tibet. Zhangzhung culture is associated with the Bon religion, which has influenced the philosophies and practices of Tibetan Buddhism. Zhangzhung people are mentioned frequently in ancient Tibetan texts as the original rulers of today's western Tibet. Only in the last two decades have archaeologists been given access to do archaeological work in the areas once ruled by the Zhangzhung. Tradition has it that Zhangzhung consisted "of three different regions: sGob-ba, the outer; Phug-pa, the inner; and Bar-ba, the middle. The outer is what we might call Western Tibet, from Gilgit in the west to Dangs-ra khyung-rdzong in the east, next to lake gNam-mtsho, and from Khotan in the north to Chu-mig brgyad-cu rtsa-gnyis in the south. Ladakh, including Lahaul and Spiti, was part of sGob-ba. The inner region is said to be sTag-gzig (Tazig) [often identified with Bactria], and the middle rGya-mkhar bar-chod, a place not yet identified." While it is not certain whether Zhangzhung was really so large, it was an independent kingdom and covered the whole of what is today's Western Tibet, Ladakh and Gilgit. The capital city of Zhangzhung was called Khyunglung ( or ), the "Silver Palace of Garuda", southwest of Mount Kailash (Mount Ti-se), which is identified with palaces found in the upper Sutlej Valley. According to Rolf Alfred Stein, author of Tibetan Civilization, the area of Shang Shung was not historically a part of Tibet and was a distinctly foreign territory to the Tibetans: "... then further west, the Tibetans encountered a distinctly foreign nation. – Shangshung, with its capital at Khyunglung. Mt. Kailāśa (Tise) and Lake Manasarovar formed part of this country., whose language has come down to us through early documents. Though still unidentified, it seems to be Indo European .... Geographically the country was certainly open to India, both through Nepal and by way of Kashmir and Ladakh.