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  The Three Shire Stone is a boundary stone that marks the location where the historic English counties of Lancashire, Cumberland and Westmorland meet.
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  Triple Frontier in South America
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  Four Corners Monument in the United States – pick your favorite three states and get a bonus for free
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  Schengen tripoint of Germany, France, and Luxembourg where the Schengen Agreement was signed, on a barge in the Moselle
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  Tripoint of Thailand, Laos and Myanmar, located on a sandbar in the Mekong
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  Tripoint of The Congo, Tanzania and Zambia is in Lake Tanganyika
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  Poeppel Corner in the middle of the Simpson Desert where the Australian states of Queensland and South Australia meet the Northern Territory
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  Several countries' territorial claims in Antarctica converge at the South Pole (ceremonial marker at Amundsen–Scott South Pole Station)

Many more fine images can be found at List of tripoints.