What is the lowland region west of the Gobi Desert that, at 505 feet below sea level, is China's lowest point?

What is the mountain range in Western China that separates China from Takzhikistan, Kirgizia, and Zazakhstan? The lowland region west of the Gobi Desert that, at 505 feet below sea level, is China's lowest point is the Turfan Depression.

on the morning of  july 21,  1861, general mcdowell ordered the  unionarmy to attack. it was on this hill that  confederate  colonel thomas jackson and his forces held back theunion  troops.