Geluo Ridge on the upper reaches of the Kizil River is in present-day Ulugqat (Ulugchat), an important mountain pass for going beyond China’s territory on the Silk Road.
"Any idea what Paul was doing in Xinjiang?" "No. The country around Ulugqat is still a forbidden zone."
2014 July 4, Michael Martina, “Muslims in China's Xinjiang told to ignore Ramadan customs”, in Nick Macfie, editor, Reuters, archived from the original on 16 August 2022, World News:
One village school near Ulugqat county close to China’s western border said students were prohibited from entering mosques, according to a party-affiliated news site, Pingan Net.