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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. There are 175 international tripoints as of 2020. [2] 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.
Usually, the more neighbours a country has, the more international tripoints that country has. China with 16 international tripoints and Russia with 11 to 14 lead the list of states by number of international tripoints. Other countries, like Brazil, India, and Algeria, have several international tripoints. Argentina has four international tripoints. South Africa, Pakistan and Nigeria have three international tripoints while Bangladesh and Mexico have one. Within Europe, landlocked Austria has nine tripoints, among them two with Switzerland and Liechtenstein. Island countries, such as Japan and Australia, have no international tripoints (some, like Bahrain and Singapore, have tripoints in the territorial waters), and the same goes for countries with their only neighbour country, such as Portugal or Lesotho. Landlocked countries also have international tripoints. Likewise, the United States with two neighbouring countries has no international tripoints; however, it has a number of state tripoints as well as one point where four states meet. Indonesia has no international tripoints, just like Australia, Japan and the United States. 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. Japan has multiple prefectural tripoints; it also has prefectural quadripoints. In addition to the United States, Canada and Indonesia, Australia also has tripoints where the boundaries of states 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 unique examples of sixfold, sevenfold, and eightfold points (see quadripoint § Multipoints of greater numerical complexity). The territorial claims of six countries converge at the South Pole in a point of elevenfold complexity, though this is an example of points subject to dispute.
International tripoints include:
Some historic tripoints:
While the exact line of an international border is normally fixed by a bilateral treaty, the position of the tripoints may need to be settled by a trilateral agreement. For example, China, Russia, and Mongolia have set the position of the two relevant tripoints (the junction points of the China–Russia border, the Mongolia–Russia border, and the China–Mongolia border) by the trilateral agreement signed in Ulaanbaatar on January 27, 1994. 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). [5]
The Five Saints, known in Mongolian as the Tabhan Bogd, is a mountain massif in Mongolia, near the triple border with China and Russia. Its highest peak, the Khüiten Peak, is the highest point of Mongolia at 4374 meters above sea level.
The Three-Country Cairn is the tripoint at which the international borders of Sweden, Norway and Finland meet, and the name of the monument that marks the point. It is the northernmost international tripoint in the world.
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.
A boundary marker, border marker, boundary stone, or border stone is a robust physical marker that identifies the start of a land boundary or the change in a boundary, especially a change in direction of a boundary. There are several other types of named border markers, known as boundary trees, pillars, monuments, obelisks, and corners. Border markers can also be markers through which a border line runs in a straight line to determine that border. They can also be the markers from which a border marker has been fixed.
Mont Dolent is a mountain in the Mont Blanc massif and lies on the border between Italy, Switzerland and France.
Khüiten Peak, also known in China as Friendship Peak, is a mountain peak in the Altai Range. The international border between China and Mongolia runs across its summit point, which, at 4,356 metres (14,291 ft), is the highest point in the Altais and the highest in both Mongolia and Altay Prefecture in Western China. The peak is covered in snow year-round.
The borders of Brazil are the international borders that Brazil shares with neighbouring countries. Brazil has terrestrial boundaries with nine countries of South America, and with the French Department of Guiana. Brazil has borders with every country in South America with the exception of Chile and Ecuador, totalling 16,885 kilometres (10,492 mi). Brazil has the world's third longest land border, behind China and Russia.
The Mongolia–Russia border is the international border between Mongolia and the Russian Federation. It runs from west to east between the two tripoints with China for 3,452 km (2,145 mi). The boundary is the third longest border between Russia and another country, behind the Kazakhstan–Russia border and the China–Russia border.
The Chinese–Russian border or the Sino-Russian border is the international border between China and Russia. After the final demarcation carried out in the early 2000s, it measures 4,209.3 kilometres (2,615.5 mi), and is the world's sixth-longest international border. According to the Russian border agency, as of October 1, 2013, there are more than 160 land border crossings between Russia and China, all of which are open 24 hours. There are crossing points established by the treaty including railway crossings, highway crossings, river crossing, and mostly ferry crossings.
The France–Switzerland border is 572 km (355 mi) long. Its current path is mostly the product of the Congress of Vienna of 1815, with the accession of Geneva, Neuchâtel and Valais to the Swiss Confederation, but it has since been modified in detail, the last time being in 2002. Although most of the border, marked with border stones, is unguarded, several checkpoints remain staffed, most notably on busy roads.
The border between the modern states of France and Germany has a length of 450 km (280 mi). The southern portion of the border, between Saint-Louis at the border with Switzerland and Lauterbourg, follows the River Rhine in a south-to-north direction through the Upper Rhine Plain. The border then turns westward until it reaches the tripoint between France, Germany and Luxembourg.
The Dreiländereck is a monument in Basel, Switzerland. It marks the tripoint where the borders of France, Germany and Switzerland meet. The France–Germany border, the Germany–Switzerland border and France–Switzerland border meet there.
The China–Mongolia border is the international border between China and Mongolia. It runs from west to east between the two tripoints with Russia for 4,630 km (2,880 mi), with most of the boundary area lying in the Gobi Desert. It is the world's fourth longest international border.
The China–Tajikistan border is 477 km (296 mi) in length and runs from the tripoint with Kyrgyzstan following a roughly north–south line across various mountain ridges and peaks of the Pamir range down to the tripoint with Afghanistan. The border divides Murghob District, Gorno-Badakhshan Autonomous Region in Tajikistan from Akto County, Kizilsu Kyrgyz Autonomous Prefecture and Taxkorgan Tajik Autonomous County, Kashgar Prefecture in Xinjiang Uygur Autonomous Region, China.
The North Korea–Russia border, according to the official Russian definition, consists of 17.3 kilometres (10.7 mi) of "terrestrial border" and 22.1 km of "maritime border". It is the shortest of the international borders of Russia.
The China–North Korea–Russia tripoint is the tripoint where the China–Russia border and the North Korea–Russia border intersect. The tripoint is in the Tumen River about 500 meters upstream from Korea Russia Friendship Bridge and under 2,000 meters from the Russian settlement of Khasan.
The Dreiländereck is a mountain in the Karavanks whose summit is the tripoint of the countries of Austria, Italy, and Slovenia. It thus is also the meeting point of three linguistic regions, German, Italian, and Slovene. The height of the summit is 1,508 m (AA).