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.
Quadripoint
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A quadripoint is a point on Earth where four distinct political territories meet. The territories can be of different types, such as national and provincial. In North America, several such places are commonly known as Four Corners. Several examples exist throughout the world that use other names.
Zambezi River at the junction of Namibia (top left), Zambia (top), Zimbabwe (bottom right), and Botswana (bottom left)
The boundary marker inscribed at the center of the Four Corners Monument, the only state quadripoint in the United States, where Arizona, Utah, Colorado, and New Mexico meet
Kuhankuono border marker