Antique rugs made in Mongolia from 1880’s to 1930’s are very rare and collectible old carpets. Mongolia, located between Russia and China is largely situated on mountains and plateaus and produced beautiful wool. The Mongols were influenced by Persian designs as well as the Chinese designs as seen in their hand woven area rugs.
See Examples:
https://antiqueorientalrugs.com/product-category/mongolian-rugs/