Mazar Tagh (Tomb Mountain) is located in the middle of the Taklamakan Desert, about halfway along the Khotan cross-desert highway, then west across the Hotan River. There are the remains of an old fortress dating from the 7th-8th century CE. Khara-Khoto is a medieval Tangut city in the Ejin khoshuu of Alxa League, in western Inner Mongolia, near the former Gashun Lake. It has been identified as the city of Etzina, which appears in The Travels of Marco Polo.