The Tuwaiq Escarpment forms a system of extensive canyons which cuts through the sandstone of Central Arabia. It starts from Buraydah in the north and extends around 1,000 km close to the northwestern edge of 'Rub Al Khali' (The Empty Quarter), south of As Sulayyil.

Tuwaiq escarpments that crosses Makkah Road in Riyadh

Tuwaiq escarpment at 'Edge of the World'

Fossils found at the limestone beds of Tuwaiq at 'Edge of the World'.

This "favia farus" like coral with its closely packed and clearly separate polyps can be seen in plenty in the waters of Farasan Islands in the Red Sea.

Rockslides from the escarpment

The hazy horizon stretching with endless line of low hills of Tuwaiq at Khathila, around 120km northeast of Riyadh. The area turns to green meadow enthralled with flowers and birds during winter after a rain