Borders are something that defines the actual area of a country and separates it from other neighboring nations. And sure enough, there are so many reasons why borders exist, the main one being the security of the people of the country within the borders, so that no one can invade it. Without a single doubt, there is literally every country on planet Earth that shares a border with other nations surrounding it, and today we’re about to take a good look at the top 10 longest borders in the world. So, here we go.
1. Canada–United States Border (8,893 km)
First of all, by the length of it, sure enough, the Canada-U.S. border is the longest one in the entire world. Well, how much are we talking about here? That would be around 8,893 km in its full length, which is just insane if you think about it for a sec. This border, often labeled as “the longest unprotected frontier,” is made up of both America and Canada and just so you know, as we talk about the history of stuff, well, this one dates back to the year 1783 when the Treaty of Paris was signed. Can you even imagine that?
2. Russia–Kazakhstan Border (7,644 km)
Next on the list had to be the 7,644-kilometer border of Russia and Kazakhstan, which is the result of modern diplomacy, you know? As for a little bit of history here, you see, in 1989, the first officially recorded boundary occurred after the breakup of the Soviet Union. This part goes through the steppes, plains, and deserts. It is not only relevant due to its geographical size but also fundamentally controls commerce, especially in the energy and agro-business.
3. Argentina–Chile Border (6,691 km)
Then, if you’ve ever imagined being in the Andes, surely you’ve seen the 6,691-kilometer border between Argentina and Chile, haven’t you? Sure enough, this thing ranges through glaciers, valleys, and peak cliffs so it is weathered thus it is the longest one in South America, that we can say for sure. All in all, yes, it is pretty apparent that despite these cultural differences, the two countries share a peaceful and cooperative relationship, which is further strengthened by thriving tourism and trade along this beautiful boundary.
4. China–Mongolia Border (4,630 km)
Coming in at number 4 is the China-Mongolia border, you know, the one that stretches over 4,630 kilometers in the middle of Asia? Yes, that one! Just to give you perspective on things, you see, the original pattern of this border was decided by Mongolia’s proclamation of independence in the year 1911, however, today it is used for trade, particularly on coal and copper dispersal which are mined in Mongolia. As far as the geography of this border goes, well, this one cuts through deserts, grasslands, and mountain chains connecting the two countries with a long-stay history, and sure enough, it is a beauty in itself.
5. China-Russia Border (4,169 km)
Next on the list, one thing we can say for sure is that the China-Russia border holds the power. To be precise, it is almost 4,169 kilometers in its full length. And a little bit of history here, you see, this border has a deep history that goes as far as the treaty of Nerchinsk in 1689. Without a single doubt, the meeting of the two nations takes place mainly by the rivers in the forests, for example, the joint project of the gas pipeline whereby China and Russia partner up, which already are strong allies in the geopolitical scene as of 2025.
6. India–Bangladesh Border (4,142 km)
Then comes the 4,142 km-long India-Bangladesh border, which sure is nothing but a complex yet significant border, but how exactly? Well, to give you a perspective on things, it hosts somewhat of its own country enclaves which contribute to the unique nature of this border that was born out of the partition of India in 1947, you know? Sure enough, there are serious issues like trafficking, however, cross-border train links are being established in an effort to enhance cooperation, just saying.
7. Brazil–Bolivia Border (3,403 km)
Then comes the most beautiful of it all, and yes, we’re talking about that stretch of rainforests, rivers, and plains, you know, the 3,403 kilometers Brazil-Bolivia border? It’s just pure beauty! Let’s have a little bit of history here, you see, this border, originally established in 1903 by the Treaty of Petropolis, today stands as the unbreakable link in the chain of trade that gets through natural resource extraction, like gas, so yes, it is pretty much super important and significant in today’s global scene.
8. India–Pakistan Border (3,190 km)
Then, let’s talk about one of the most disputed borders in the entire world, and yes, we’re talking about the 3,190-kilometer India-Pakistan border, which is a big deal for both countries. If you don’t know the history of it, well, just to give a brief idea, this very border was cut out due to the partition of the land in 1947, and its path was through sand, river, and farm. The one point of contention at the border today is still the trade that takes place on it, but through the years it will have gone closer to normalcy and security as well as cooperation in the coming months.
9. United States–Mexico Border (3,155 km)
In the latest United States elections, illegal immigration was a big concern, and that’s mainly because of this 3,155 kilometers-long United States-Mexico border, which is not protected at its full length, allowing millions of people to pour into the country easily. Sure enough, the new President-Elect, Mr. Donald Trump has given assurance to fix things up with this border, so, let’s see what happens next.
10. Afghanistan–Pakistan Border (2,640 km)
Last on the list is the 2,640 kilometers of wild terrain and fluctuating elevations through the Durand line, the Afghanistan-Pakistan border is a part of the rugged West, really? Well, it was first demarcated by the British in 1893, and thus despite its political sensitivities, it has been a crucial route for both trade and migration ever since.
Conclusion
There you have it. These are currently the most expansive aka longest borders in the world. Sure, there are disputes over some of them, but still, by popular opinion, and factual data, these had to be the top 10 longest ones.
Brandon is the cheif editor and writer at WorldUnfolds.com. With a passion for storytelling and a keen editorial eye, he crafts engaging content that captivates and enlightens readers worldwide.
