Much of the Afghanistan-Tajikistan border tracks along the Pyanj River, which is also known as Panj or Pyandzh, depending on where you are.

Stretching 700 miles (1,125km), it’s a vital artery of Central Asia and was once part of the ancient Silk Road route. Its glacial waters have supported agriculture for generations, but border tensions and Soviet-era mines affect access. The US-funded Friendship Bridge at Nizhni Pyanj is one of the border's few formal crossing points.

Liked this? Click the Like button above. And click the Follow button above for more great stories from loveEXPLORING

Now discover the world's most dangerous tourist attractions

The world's most unusual country borders