The Mongolia–Russia border is the international border between Mongolia and the Russian Federation. It runs from west to east between the two tripoints with China for 3,452 km (2,145 mi). The boundary is the third longest border between Russia and another country, behind the Kazakhstan–Russia border and the China–Russia border.
The Sino-Russian border within the regions of Mongolia, as it ran throughout the 19th century, largely corresponded to today's Mongolia–Russia border; the main difference is the absorption of Tuva into Russia
The Tawan Bogd is a mountain massif in Mongolia, near the triple border with China and Russia. Its highest peak, the Khüiten Peak, is the highest point of Mongolia at 4374 meters above sea level.
View of Tawan Bogd from Russian Altai