The region of Xinjiang is home to the Uighurs, a mostly-Muslim ethnic minority currently being heavily surveilled by the Chinese government. Uighurs refer to the region as East Turkestan.
Xinjiang's major cities are easily accessible, but its more remote regions are not.
To travel from Ürümqi, the capital of Xinjiang, to Altay, it takes about one hour by plane, 9 hours by day bus, 12 hours by night bus and about 14 hours by train, according to Reuters.
Source: Reuters