Question

what natural border can be found to the southwest of ancient china?
○ gobi desert
○ the great wall of china
○ himalaya mountain range
○ taklimakan desert

Explanation:

The Gobi Desert is north of Ancient China, the Great Wall is a man-made structure not a natural border, and the Taklimakan Desert is west of Ancient China. The Himalaya Mountain Range is the natural border located to the southwest of Ancient China.

Answer:

Himalaya Mountain Range