Top 10 Volcanoes in Saudi Arabia
Most people associate Saudi Arabia with oil rather than lava. Yet beneath the sands and gravel plains of the Hejaz and Medina provinces lies one of the most extensive volcanic systems on Earth. The Harrat lava fields — vast sheets of young basalt interspersed with cinder cones, spatter ramparts and obsidian outcrops — cover a north-south corridor roughly 1,800 km long and up to 300 km wide along the western edge of the Arabian Peninsula. The last confirmed eruption occurred at Harrat Rahat in 1256 CE, close enough to Medina that Islamic historical accounts describe the lava flow advancing towards the city walls.
The Harrat System: Scale and Science
The Arabic term harrah (plural harrat) means a rocky lava field strewn with boulders, and the Harrat fields of Arabia are exemplary of the type. They formed primarily during the Cenozoic as the Arabian Plate separated from the African Plate, opening the Red Sea and generating a chain of hotspot-influenced volcanism along the emerging coastline. The fields are not a single eruption site but a mosaic of vents active at different times over the past 30 million years, with the most recent activity confined to the Holocene.
Harrat Rahat: The Medina Field
Harrat Rahat is the largest of Saudi Arabia's lava fields, covering approximately 20,000 km² southeast of Medina. It stretches 300 km in length and up to 75 km in width. The 1256 CE eruption, known in Arabic accounts as the basaltic flood, issued from a fissure vent at the northern end of the field and produced a lava flow that reached within a few kilometres of Medina's historic centre. Modern geological surveys have identified more than 800 vents within Harrat Rahat, many forming perfectly conical cinder cones still sharp in outline.
Harrat Khaybar: Black Giants on the Desert Floor
Some 150 km north of Medina, Harrat Khaybar contains some of the most spectacular individual volcanic features in Arabia. The field covers roughly 14,000 km² and includes thick shield volcanoes reaching 2,093 m at Jabal Qidr. Scattered across the black basalt plain are dozens of scoria cones, lava tubes and maar craters. Jabal Bayda and Jabal Abyad are two white rhyolite domes that stand out dramatically against the surrounding black lava — their pale silica-rich rock is chemically distinct from the basalt and indicates a separate, more silicic magma source.
Harrat Ithnayn and the Northern Fields
North of Khaybar, the Harrat Ithnayn, Harrat Uwayrid and Harrat Hadan fields continue the volcanic chain into the Tabuk Province. Harrat Uwayrid near Tayma contains some of the youngest-looking lava surfaces in Saudi Arabia, with flow structures so fresh that the ropy pahoehoe texture is clearly preserved. The Tayma Oasis, an ancient caravan centre mentioned in Babylonian texts, sits on the edge of this field — merchants and pilgrims crossing Arabia for millennia did so through volcanic terrain.
Harrat Al-Birk on the Red Sea Coast
Where the Asir Mountains drop to the Tihama coastal plain along the Red Sea, the Harrat Al-Birk field represents the southernmost major lava plateau in Saudi Arabia. Here volcanic rocks meet coral reefs in the shallow water of the Red Sea, creating a geologically unusual coastline. Submarine volcanic features are reported in the southern Red Sea, and the proximity of the volcanic arc to the Tihama plain makes this one of the most tectonically dynamic zones in the country.
Cinder Cones and Maar Craters
Throughout the Harrat fields, cinder cones are the most common volcanic feature. They typically rise 50–150 m above the surrounding lava plain, have summit craters 50–300 m wide, and were formed by Strombolian eruptions over periods of weeks to months. Maar craters — low-rimmed explosion craters formed when rising magma contacted groundwater — are rarer but occur in several fields including Harrat Khaybar. Some maar lakes existed in wetter Pleistocene climates; today most are dry, their flat floors occasionally used for farming after rare rainfall events.
Ancient Lava Tubes and Cave Systems
Harrat Khaybar contains one of Arabia's most extensive networks of lava tubes. These hollow subsurface tunnels formed when the outer skin of a lava flow cooled and solidified while molten rock continued to drain through the interior. Some tubes extend for several kilometres and reach widths of 10–15 m. Bat colonies use the tubes year-round, and rock art — petroglyphs of camels, ibex and human figures — has been documented near tube entrances, suggesting prehistoric communities sheltered here.
Volcanic Hazard and Modern Monitoring
Saudi Arabia's Geological Survey (SGS) operates a seismic monitoring network covering the main Harrat fields, with particular attention to Harrat Rahat given its proximity to Medina, now home to around one million residents. Seismic swarms have occurred beneath Harrat Lunayyir in 2009, when a magnitude 5.4 earthquake accompanied ground deformation interpreted as shallow magma intrusion. No eruption followed, but the event demonstrated that the Harrat system remains geologically restless.
Visiting the Harrat Fields
Access to the main Harrat fields has become somewhat easier following Saudi Arabia's 2019 tourist visa reforms. Harrat Khaybar is reachable by four-wheel drive from Medina or Al-Ula, with the journey taking roughly three to four hours on paved and graded tracks. There are no visitor facilities on the lava fields themselves; travellers must be self-sufficient with water, fuel and navigation equipment. The best visiting season is November to February when temperatures drop to a manageable 15–25 °C.
Explore on the map
Saudi Arabia's lava fields are spread across a vast territory that rewards spatial exploration — use the interactive map to locate each Harrat field and understand the volcanic corridor running parallel to the Red Sea coast. Find Saudi Arabia on the map to trace the full extent of this extraordinary volcanic landscape, from Harrat Al-Birk in the south to Harrat Uwayrid near Tabuk in the north.