There has been a lot of discussion recently over “border walls”, protecting geography and “refugees”. Perhaps it would be interesting to revisit this earlier report from January 2015:

1,000km border wall called the “Northern Border Security Project”

SAUDI ARABIA – Islamic State lists the capture of Saudi Arabia, home to the holy Muslim grounds of Mecca and Medina, as a key goal.

Just over a week ago, IS militants launched an attack on a Saudi border post, killing a senior Saudi general and two border guards, marking the first direct IS assault on Saudi grounds, The Telegraph reported.

In an effort to defend itself from the IS threat and further attacks, the kingdom launched a massive project to construct a “Great Wall” along it’s northern border with Iraq, where IS presence is heavy.

Proposed in 2006, the border zone entails five layers of fencing, supplemented by watch towers, radar cameras, night-vision security, and a heavy presence of extra Saudi troops, according to the report.

The wall is set to extend nearly 1000-km and will combine fence and ditch barriers along the northern Saudi border. (link)