The Western Regions or Far West Region (西西域；Xixiyu; literally West of West Region) is an arid desert region to the west of Tushan. It is where Desert Fox Spirits like Fan Yunfei live. It is part of the Water Bead Arc.
It appears to be modeled after the ancient Xiyu (西域) region, which referred to the western territories of Central Asia that were controlled by the Han and Tang dynasties of China.