Western Mongolia is a region  in Mongolia covering the provinces of Bayan-ulgii, Hovd, Uvs and Zavkhan. The dominant feature of western Mongolia is Altai mountains, Mongolia's highest mountain range, which stretches from Russia through Bayan-ulgii and Khovd and on to the adjacent Govi-Altai province. It contains many challenging and popular peaks for climbers, and is the source of several rivers which eventually flow into the Arctic and Pacific ocean.