Tuwaiq, Mountain range near Riyadh, Saudi Arabia
Tuwaiq is a mountain range and long limestone escarpment that stretches for almost 800 kilometers through central Saudi Arabia, running from the Qasim plateau southward to the edge of the Rub al-Chali desert. The escarpment rises roughly 250 meters (800 feet) to 600 meters (2000 feet) above the eastern lowlands and forms a natural barrier that slopes gently westward and drops sharply eastward, shaping the landscape between the Najd highlands and the coastal plains.
The region served as a retreat for Saudi forces in 1818 when they withdrew from an invasion. Centuries earlier, trade routes passed through the wadis that cut through the escarpment, linking Hadramaut with the interior of the Arabian Peninsula.
The name Tuwaiq derives from 'Tawq', meaning ring or circle in Arabic, reflecting the curved shape of its mountain peaks.
Large wadis such as Hanifa and Nisah cut through the limestone walls and form natural corridors where roads pass and settlements in the east connect with those on the plateau. The area lies close to Riyadh, making it accessible for hikers and day trippers who should arrive early in the morning to avoid heat.
Geological layers in the limestone date back to the Middle Jurassic and help researchers understand oil and gas reservoirs deep beneath the surface. The rock formations create natural arches and pillars in some places, drawing climbers and photographers, though they remain largely invisible from main roads.
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