It's a old trek from north xinjiang to south xinjiang across the TianShan range.It's part of old silk road. The Tian Shan, meaning the Mountain of Heaven or the Heavenly Mountain, is a large system of mountain ranges located in Central Asia. The highest peak in the Tian Shan is Jengish Chokusu, at 7,439 metres (24,406 ft) high. Its lowest point is the Turpan Depression, which sits at 154 m (505 ft) below sea level.The Chinese name for Tian Shan may have been derived from the Xiongnu word Qilian