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:''For other meanings, see tripoint (disambiguation)''. A tripoint, trijunction, triple point or tri-border area is a geographical point at which the borders of three countries or subnational entities meet. There are approximately 176 international tripoints.〔https://www.jiscmail.ac.uk/cgi-bin/webadmin?A2=ind1001&L=INT-BOUNDARIES&T=0&F=&S=&X=78F2250D58E03ACBA8&P=59〕 Nearly half are situated in rivers, lakes or seas. When on dry land, the exact tripoints are usually indicated by markers or pillars, and occasionally by larger monuments. Usually, the more neighbours a country has, the more international tripoints that country has. China with 16 tripoints and Russia with 11 to 14 lead the list of states by number of tripoints. Within Europe, landlocked Austria has nine tripoints, among them two with Switzerland and Liechtenstein. Island countries such as Japan have no tricountry points (some, like Bahrain and Singapore, have tripoints in the territorial waters), nor have states with only one neighbour state, like Portugal or Denmark. Likewise the United States with two neighbour states has no tricountry points; it has a number of tristate points as well as one point where four states meet. Canada, as well, has a four-point area, where Nunavut, Manitoba, Saskatchewan, and the Northwest Territories meet. Border junctions (or "multiple points" or "multipoints" as they are also sometimes called) are most commonly threefold. There are also a number of quadripoints, and a handful of fivefold points, as well as probably unique examples of a sixfold, sevenfold, and eightfold point. No more than eight borders meet at a single multipoint anywhere on earth, but the territorial claims of six countries converge at the south pole in a point of elevenfold complexity. It is often illegal to pass a national border outside border controls, and therefore illegal to walk around many tripoint markers. According to the Schengen rules, it is illegal to pass the outside border of the Schengen area except at border controls.〔(The Schengen Acquis. See Title II, chapter 2 )〕 But it is legal to pass the border between two Schengen countries at any place. Countries with good relations will generally have the checkpoints a bit off the technical border line to allow tourists to walk around border marker monuments without getting in the way of immigration authorities. ==Examples== Well known international tripoints include: * the Treriksröset of Finland, Norway, and Sweden (the northernmost international tripoint in the world; the exact point is in a lake, but a marker is built on that point) * the Vaalserberg of the Netherlands, Germany, and Belgium * the "Dreiländereck" of Germany, France, and Switzerland (the exact point is in the river and the marker is not on the exact point) * the Schengen tripoint of Germany, France, and Luxembourg (where the Schengen Agreement was signed, on board a boat, since the tripoint is in the river) * the Triple Frontier of Argentina, Brazil, and Paraguay * the Tres Fronteras of Brazil, Peru, and Colombia * the Mont Dolent of Italy, France, and Switzerland (the exact point is not at the peak but around to the northwest) * Bratislava is the only capital city in the world which is located at a tripoint: Slovakia, Hungary, Austria Some historic tripoints: * the historic Three Emperors' Corner of Austria–Hungary, the Russian Empire, and German Empire * the historic Piz da las Trais Linguas (Ortler Alps) of Austria–Hungary, the Kingdom of Italy, and Switzerland * the historic Rock of the Three Kingdoms between the former kingdoms of Galicia, León, and Portugal (now part of the border between Kingdom of Spain and the Portuguese Republic).〔(Treaty on boundaries between Spain and Portugal from the mouth of the Minho River to the junction of the river Cay a with the Guadiana. Signed at Lisbon on 29 September 1864 ) 〕 * the Tossal dels Tres Reis ('Peak of the Three Kings'), located where the borders of the ancient Kingdoms of Valencia, Catalonia, and Aragon meet.〔(【引用サイトリンク】title=Mapa Topogràfic de Catalunya ).〕 For a full list, see list of tripoints. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Tripoint」の詳細全文を読む スポンサード リンク
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