World's barriers: Korean border

The Demilitarized Zone (DMZ) is one of the most heavily-guarded borders in the world

On the 20th anniversary of the fall of the Berlin Wall, BBC Mundo looks at barriers which are still standing - or have gone up since - around the world.

WALLS STILL STANDING West Bank Northern Ireland Saudi Arabia Melilla and Ceuta Cyprus Pakistan-Iran Rio de Janiero Mexico-US India-Pakistan Korean border Western Sahara Iraq-Kuwait Botswana-Zimbabwe

A strip of territory 4km (2.5 miles) wide by 250km long divides North and South Korea.

It cuts the peninsula down the middle, roughly through the "38th Parallel".

The zone was created in 1953, when the war between the two Koreas, in which three million people died, ended in a ceasefire.

For many years it was considered to be one of the most acute fault lines of the Cold War.

Even now, despite moves towards reconciliation between the two countries, it remains a symbol of the latent tension in the peninsula.