Major Geographic Features of Saudi Arabia

Landscape of the Arabian Peninsula's Giant

Saudi Arabia (2.15M km²) dominates the Arabian Peninsula. Its geography is defined by desert expanses, coastal waters, mountain escarpments, and ancient hydrology.

1. Arabian Peninsula Platform

Saudi Arabia covers ~80% of the peninsula—a tilted Precambrian shield (west) sloping east under sedimentary cover (Phanerozoic).

2. Red Sea Coast (West)

• 1,800 km coastline
• Coral reefs, mangroves, seagrass beds
• Rift valley geology (spreading center)
• Ports: Jeddah, Yanbu, Jizan, NEOM

3. Persian/Arabian Gulf Coast (East)

• 560 km coastline
• Shallow, saline, oil-rich waters
• Major ports: Dammam, Jubail, Ras Tanura, Ras Al-Khair
• Bahrain, Qatar, UAE across the water

4. Rub' al Khali (Empty Quarter)

• World's largest continuous sand desert: 650,000 km² (size of France)
• SE Saudi Arabia, into Yemen, Oman, UAE
• Linear dunes 100–250m high; hyper-arid (<35 mm rain/yr)
• Oil/gas fields (Shaybah, Kidan); ancient lake beds (paleolakes)

5. An Nafud Desert (North)

• ~65,000 km² red sand desert
• Transverse dunes, paleolakes, prehistoric sites
• Bordered by Hisma plateau (west) and Ad-Dahna (south)

6. Tuwaiq Escarpment (Central Spine)

• 800-km cuesta (asymmetric ridge) running N–S
• Western cliff (200–300m) overlooks Najd plateau
• Eastern dip slope into Ad-Dahna desert
• Fossil-rich limestone (Jurassic); Riyadh sits at its eastern foot

7. Jabal Sawda (Highest Peak)

• 3,133 m (10,279 ft) — highest in KSA
• Sarawat Mountains (Asir), near Yemen border
• Juniper forests, fog condensation, endemic species

8. Wadi ar-Rummah (Longest Dry Valley)

• ~1,200 km (Medina → Persian Gulf)
• Ancient river system (Pleistocene)
• Recharges aquifers; flash flood conduit

9. Jebel Marra / Asir Highlands

• Volcanic peaks (Jabal al-Qahr: 3,000 m)
• Terraced agriculture, coffee, frankincense history
• Biodiversity hotspot (Arabian leopard, endemic birds)

10. Farasan Islands (Red Sea)

• 80+ coral islands, 40 km offshore (Jizan)
• Marine sanctuary: dugongs, turtles, migratory birds
• Ottoman fort, pearling history; tourism development

Saudi geography = desert heart, coastal wealth, mountain rim, hidden water.