Explanation

China has a claim on part of the Indian province of Arunachal Pradesh.

It refers to the region as "South Tibet" and disputes the international border.

It leading to ongoing tensions between India and China.

Explanation

The Maginot Line  is a line of concrete fortifications, obstacles, and weapon installations built by France in the 1930s to deter invasion by Germany and force them to move around the fortifications.

Explanation

1. Turkey
2. Bulgaria
3. Romania
4. Ukraine
5. Russia
6. Georgia

Explanation

The border between USA and Canada is the largest border in the world.

Length: 8891 km