18 Border Disputes That Are Still Ongoing

Even in an age of satellites and global diplomacy, dozens of international borders remain unsettled, where history, pride, and politics collide.

Chris Graciano
February 16, 2026
5 min read

18 Border Disputes That Are Still Ongoing — Greg Bulla on Unsplash

Around the world, many borders still lack true resolution. There are lines drawn by war or colonialism that nations never fully agreed upon. These disputes aren’t just about maps; they’re about culture and sometimes valuable land or resources. From icy plateaus to tropical islands, these 18 ongoing border conflicts prove that Earth’s boundaries are anything but fixed.

1. India and China – The Line of Actual Control (LAC)

This long Himalayan frontier remains one of the world’s most tense borders. The two nations never agreed on an official demarcation, leading to clashes in areas like Ladakh and Arunachal Pradesh. Despite talks and treaties, both sides maintain troops and infrastructure in disputed high-altitude zones.

2. Russia and Ukraine – Crimea and Donbas

Since 2014, Russia’s annexation of Crimea has been rejected by most of the world, while ongoing fighting in eastern Ukraine continues to redraw realities on the ground. Both regions remain heavily militarized, and diplomatic solutions have repeatedly stalled. It’s a modern border dispute with deep historical roots.

3. Israel and Palestine – The West Bank and Gaza

The Israeli–Palestinian conflict centers on disputed land and sovereignty. Israel controls much of the West Bank and blockades Gaza, while Palestinians seek recognized borders for their own state. Despite decades of negotiation, peace agreements, and international mediation, the borders remain undefined and contested.

4. China and Taiwan – Sovereignty Dispute

China views Taiwan as a breakaway province, while Taiwan considers itself a self-governing nation. Though there’s no physical border, the Taiwan Strait acts as a tense divider patrolled by military forces on both sides. Diplomatic recognition remains one of the most sensitive geopolitical issues in Asia.

5. India and Pakistan – Kashmir

Since the partition in 1947, both nations have claimed the entirety of Kashmir while controlling different parts. The Line of Control divides Indian-administered Jammu and Kashmir from Pakistan-administered Gilgit-Baltistan and Azad Kashmir.

6. Armenia and Azerbaijan – Nagorno-Karabakh

This mountainous region has been disputed for over a century, reignited recently in violent conflict. Though Azerbaijan reclaimed most of the territory in 2020, border clashes still erupt along the new demarcation lines. The fate of the local Armenian population remains deeply uncertain.

7. North Korea and South Korea – The Korean Peninsula

Separated by the Demilitarized Zone (DMZ), the two Koreas are technically still at war, having only signed an armistice in 1953. Despite the absence of active fighting, both sides maintain vast militaries along the 160-mile border. Occasional incidents remind the world that peace is still fragile.

8. Serbia and Kosovo – Recognition and Borders

Kosovo declared independence from Serbia in 2008, but Belgrade refuses to recognize it. The border between them is marked by checkpoints, but Serbia still claims Kosovo as its province. Sporadic protests and tensions flare, especially in areas with mixed ethnic communities.

9. China and Bhutan – The Doklam Plateau

China’s claim over Bhutan’s northern and western territories, especially Doklam, has led to periodic standoffs. India, a close ally of Bhutan, also patrols the area, adding complexity. Negotiations continue, but both sides maintain troops near the disputed zone.

10. Morocco and Western Sahara

Morocco controls most of Western Sahara, but the Polisario Front claims it as an independent Sahrawi Arab Democratic Republic. The area is divided by a fortified sand wall, with Morocco on one side and rebels on the other. UN efforts for a referendum on independence have stalled for decades.

11. Ethiopia and Sudan – Al-Fashaga Triangle

This fertile region along the border between Ethiopia and Sudan has been claimed by both nations. Clashes between local farmers and military forces have broken out repeatedly. Even as both countries face internal conflicts, neither is willing to concede the land.

12. Venezuela and Guyana – Essequibo Region

Venezuela claims about two-thirds of Guyana’s territory west of the Essequibo River, a dispute dating back to the 19th century. Recently, oil discoveries in the area have reignited tensions. International mediation continues, but both sides refuse to yield ground.

13. Japan and Russia – Kuril Islands / Northern Territories

After World War II, the Soviet Union took control of the Kuril Islands north of Japan. Japan still claims four of them, calling them the Northern Territories. This unresolved dispute has prevented the two nations from signing a formal peace treaty to this day.

14. China and India – Arunachal Pradesh

Separate from the Ladakh standoff, China also claims the Indian state of Arunachal Pradesh as “South Tibet.” India administers the region and maintains a strong military presence there. Occasional clashes occur, particularly in remote passes high in the Himalayas.

15. Greece and Turkey – Aegean Sea Boundaries

Both countries dispute maritime borders, airspace, and rights to islands in the Aegean Sea. The disagreements extend to gas exploration and migration patrols. Although both are NATO members, their naval encounters keep tensions simmering.

16. Croatia and Slovenia – Piran Bay

This European border dispute focuses on maritime access to the Adriatic Sea. Slovenia wants full access through Piran Bay, while Croatia insists on dividing it evenly. Despite arbitration rulings, neither side fully accepts the outcome, keeping the disagreement alive.

17. India and Nepal – Kalapani Region

India and Nepal both claim the Kalapani, Lipulekh, and Limpiyadhura areas near their shared Himalayan border. The issue flared in 2020 when both nations released conflicting maps. The dispute remains unresolved, though both governments avoid direct confrontation.

18. China and the Philippines – Spratly Islands

In the South China Sea, overlapping claims between China and the Philippines have turned tiny reefs into flashpoints. Despite an international tribunal ruling in Manila’s favor in 2016, Beijing continues to occupy and build on several disputed islands. Naval standoffs and diplomatic protests persist yearly.