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 peak of Mt Munku Sardyk is located on the Mongolia–Russia border
Tourists at the border
Border sign
A triple border, tripoint, trijunction, triple point, or tri-border area is a geographical point at which the boundaries of three countries or subnational entities meet. There are 175 international tripoints as of 2020. Nearly half are situated in rivers, lakes or seas. On dry land, the exact tripoints may be indicated by markers or pillars, and occasionally by larger monuments.
A disputed tripoint between Syria, Israel, and Jordan
Vaalserberg: Tripoint (Germany / Netherlands / Belgium)
Marker at Tarvagan Dakh Mongolia Russia China tripoint in 2020, from the Mongolian side
The confluence of the Iguazú and Paraná rivers is the tripoint between Brazil, Paraguay and Argentina.
