Tripoint
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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.
Triple Frontier
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The Triple Frontier is a tri-border area along the junction of Argentina, Brazil and Paraguay, where the Iguazú and Paraná rivers converge. Near the confluence are the cities of Puerto Iguazú (Argentina), Foz do Iguaçu (Brazil) and Ciudad del Este (Paraguay). This area is near Iguazú Falls and the Itaipu hydroelectric plant.
View from the Argentine side of the border.
Argentine Obelisk
Paraguay Obelisk
Signpost on Brazilian side noting the triple frontier