Richard Spencer reports at the Telegraph:
The Saudis are building a 600-mile-long "Great Wall" -- a combined fence and ditch -- to separates the country from Iraq to the north.
Much of the area on the Iraqi side is now controlled by Isil, which regards the ultimate capture of Saudi Arabia, home to the “Two Holy Mosques” of Mecca and Medina, as a key goal.
'Work began in September last year after Isil’s charge through much of the west and north of the country gave it a substantial land border with the Kingdom to the south," Spencer reports.
"The border zone now includes five layers of fencing with watch towers, night-vision cameras and radar camera," according to the Telegraph. The Saudi's have "also created a physical barrier along parts of the even longer, 1,000-mile border with Yemen to the south."
