Tripoint

A triple border, tripoint,[citation needed] trijunction,[1] triple point, or tri-border area is a geographical point at which the boundaries of three countries or subnational entities meet.

On dry land, the exact tripoints may be indicated by markers or pillars, and occasionally by larger monuments.

Canada, as well, which has a maritime border with two other countries, has no international tripoints; however, it has five tripoints on land where the boundaries of provinces and territories meet, and one quadripoint where four provinces and territories meet.

Border junctions (or "multiple points" or "multipoints" as they are also sometimes called) are most commonly threefold.

The agreement specified that a marker was to be erected at the eastern tripoint, called Tarvagan Dakh (Tarbagan Dakha), but that no marker would be erected at the western tripoint (which was defined as the peak of the mountain Tavan-Bogdo-Ula (Kuitunshan, Tavan Bogd Uul).