The world’s oldest border is Andorra’s 120-km frontier with France and Spain, established by the Pareatge of 1278.
What is world’s longest border?
Canada’s 8,890-km border with the United States is the longest international land border in the world.
That undefended stretch runs 6,416 km through 13 U.S. states and 8 Canadian provinces. It’s also one of the most closely integrated cross-border regions you’ll find. According to the CIA World Factbook, Russia–Kazakhstan comes in second at 7,644 km, followed by Argentina–Chile at 5,308 km.
What is the oldest border in Asia?
The Treaty of Zuhab of 1639, between the Ottoman and Safavid Empires created the border still in use today between Iran and its western neighbors.
That treaty ended 150 years of on-again, off-again warfare and locked in a frontier that still separates Iran from Turkey and Iraq. Historians at the Britannica call it the only Asian border continuously recognized since the early 1600s.
What country in the world has had the same political boundaries for the longest period of time?
San Marino has maintained essentially the same borders since 301 CE.
Its 61 km² pocket of land, completely surrounded by Italy, hasn’t budged in more than 1,700 years. UNESCO records confirm this remarkable stability. The next-longest continuous borders belong to Andorra (since 1278) and Liechtenstein (since 1434).
How did Borders begin?
Borders originate through conflict, colonization, or negotiated treaties that delimit sovereign space.
First, surveyors mark lines on maps. Then diplomats negotiate exact coordinates. Finally, physical markers go into the ground. The United Nations codifies these boundaries in treaties that remain in use today.
Which country has only one Neighbour?
| Country | Neighbour | Border length (km) |
|---|
| Monaco | France | 4.4 (2.7 mi) |
Monaco’s entire land frontier is a 4.4 km strip hugging southeastern France. The next single-neighbor countries are Vatican City (Italy only) and Lesotho (South Africa only).
What country has no borders?
| km² Country |
|---|
| 270,467 New Zealand |
| 109,884 Cuba |
| 103,000 Iceland |
| 65,610 Sri Lanka |
New Zealand is the only sovereign nation completely surrounded by water. Its two main islands and outlying territories sit in the South Pacific Ocean with no land neighbors at all.
Which is the most confusing border in the world?
The Belgium–Netherlands enclave complex is widely regarded as the most complicated international boundary.
Inside this 2,600 km² area you’ll find 22 Belgian enclaves inside Dutch territory and six Dutch counter-enclaves inside Belgian ones. That creates a 400-year-old jigsaw puzzle. UNESCO calls it a “living monument to medieval feudalism.”
Which country has largest boundary?
| Characteristic | Length (km) |
|---|
| Canada – United States | 8,893 |
| Kazakhstan – Russia | 7,644 |
The Canada–U.S. boundary is also the longest undefended frontier on Earth. It stretches from the Atlantic Ocean to the Arctic Ocean, passing through 13 U.S. states and 8 Canadian provinces and territories.
Which country has the shortest border in the world?
Zambia’s 150-meter border with Botswana at Kazungula is the shortest international land border.
Right next to it sits Morocco’s 85-meter border with the Spanish exclave Peñón de Vélez de la Gomera. Both are shorter than two football fields laid end to end.
Which city has the longest border in the world?
The international border between Kazakhstan and Russia runs 6,846 km across steppe, forest, and mountain.
This continuous line is the longest single international boundary tied to any city-proximate area. No single city spans the entire length, but several cities sit directly adjacent along portions of the frontier.
How many countries are in this world?
As of 2026 there are 195 countries: 193 UN member states plus the Holy See and the State of Palestine.
The count hasn’t changed since 2011, when South Sudan joined the UN. If you include recognized but non-UN entities like Kosovo and Taiwan, the de-facto total jumps to anywhere from 197 to 206 depending on who’s doing the counting.
Which country has the longest border with China?
Mongolia shares a 4,677 km border with China, the longest for both nations.
China’s next-longest borders are with Russia (4,209 km) and Kazakhstan (1,533 km). Mongolia’s frontier stretches from the Altai Mountains in the west to the Greater Khingan Range in the east.
What was the first nation on earth?
The Republic of San Marino founded on 3 September 301 CE is recognized as the world’s oldest surviving sovereign state.
Its founding document, the “Statuti di San Marino,” remains in force today. San Marino’s territory has never been annexed. The Britannica places San Marino ahead of Ethiopia and Japan in continuous statehood.
What are man-made borders?
Man-made borders are lines drawn by humans to divide sovereign territory or regulate land use.
These borders often follow parallels of latitude or meridians of longitude, creating straight-line geometries that ignore natural features. The CIA World Factbook maps thousands of such boundaries worldwide.
What are some man-made borders?
Examples include the 38th parallel dividing North and South Korea, and the 49th parallel between the U.S. and Canada.
Other well-known man-made borders are the Durand Line between Afghanistan and Pakistan and the Radcliffe Line that split India and Pakistan in 1947. Straight lines like these were drawn by colonial administrators and remain in use today.
Edited and fact-checked by the MeridianFacts editorial team.
