Gaochang, also called Qara-hoja or Kara-Khoja, is the site of an ancient oasis city built on the northern rim of the inhospitable Taklamakan Desert in Xinjiang, China. The site is also known in published reports as Chotscho, Khocho, Qocho, or Qočo. During the Yuan and Ming dynasties, Gaochang was referred to as "Halahezhuo" (Qara-khoja) and Huozhou.
A busy trading center, it was a stopping point for merchant traders traveling on the Silk Road. It was destroyed in wars during the 14th century, and old palace ruins and inside and outside cities can still be seen today. The ruins are located 30 km southeast of modern Turpan. Nearby Gaochang is the site of the Astana tombs.