‘Uruq Bani Ma’arid

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A Journey Through 'Uruq Bani Ma'arid: A Desert Haven in Southern Saudi Arabia

Nestled within the vast expanse of the Rub' al Khali, the largest continuous sand sea on Earth, lies 'Uruq Bani Ma'arid, a protected area that stands as a testament to the resilience of nature and human coexistence. Inscribed as a UNESCO World Heritage Site in 2023, this remarkable region offers a unique blend of breathtaking landscapes, diverse ecosystems, and a rich cultural heritage.

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UNESCO Description of the World Heritage Site

The property encompasses the western part of the greatest expanse of windblown sand on Earth, known as Ar Rub' al-KhaIi, and conserves a portion of one of the Earth’s most spectacular desert landscapes. The varied topography of the property creates a wide range of ecosystems. The site is globally notable due to the reintroduction of iconic desert animals, including the Arabian Oryx (Oryx leucoryx) and Arabian Sand Gazelle (Gazella marica). In the case of the oryx, this was after decades of extinction in the wild. The mobile dunes also provide an excellent and well-oxygenated habitat for sand-diving invertebrates and reptiles, while incised wadis in the limestone plateau harbor rare relict plants. The area has also been used for generations by pastoral, nomadic Bedu.

UNESCO Justification of the World Heritage Site

Criterion (vii): 'Uruq Bani Ma'arid is an iconic hyper-arid sand desert representing the largest sand sea on Earth, Ar-Rub' al-Khali. Where the sands meet the Tuwayq escarpment, they form an extraordinary spectrum of juxtaposed contrasts and fusions of forms and colours. 35 longitudinal sand dunes (‘uruq in Arabic) reach up to 200 km in length and rise up to 170 m in height. Their wavelength ranges between 2.5 and 4.5 km. The property is also distinguished by the widespread presence of zibars, which are particularly well-developed in the property. Zibars are features that are generally of low relief, without well-formed slip faces, and composed of coarse and relatively poorly-sorted sand. The property serves as an ecological refuge for iconic wildlife of the desert and offers a world-class panorama of the windblown sands of the Ar-Rub' al-Khali desert, with some of the world’s highest longitudinal dune fields, and inter-dunal corridors, eastward-flowing high vegetation wadis, the Tuwayq Escarpment engulfed by westward flowing sands, and low sand plains to the west of the escarpment. A wide spectrum of colour harmonies derives from the resonance of contrasting hues of the sand grains in the ripples that cover the dunes. A true portrait of the desert where the light-coloured Arabian Oryx (or wudayhi, meaning clear in Arabic) contrasts against the large-scale and dramatic backdrop of the hyper-arid environment.

Criterion (ix): The varied topography of the property creates a wide range of wildlife habitats and niches, including ecological refuges for the Arabian Oryx, Arabian Sand Gazelles and Arabian Mountain Gazelles, successfully reintroduced into their natural habitats (in the case of the Arabian Oryx, after decades of extinction in the wild), with each having 19%, 25% and 2% respectively of their total worldwide population present within the property. The animal populations are completely free ranging in a huge area with a high level of ecological integrity. Ingenious adaptations by plant and animal species to the hostile environment and speciation processes can be observed. The Arabian Sand Gazelle is adapted to great extremes of temperature and drought and the Arabian Oryx is able to adapt to rising temperatures. The property counts 526 recorded species at the time of inscription, forming an intact ecosystem. The Tuwayq Escarpment and its associated network of inland wadis play a vital role to support woody perennial plants, which are essential as feeding and shelter areas for the flagship species. Whilst low on biodiversity compared to other desert properties globally, 'Uruq Bani Ma'arid appears to exhibit the richest flora in the Ar-Rub’ al-Khali with 118 plant species recorded and a high level of endemism. The area also hosts five reptile species endemic to Arabia and it is a critical site for plant conservation, with locally endemic, near-endemic, regionally endemic and/or regional range-restricted taxa.

Encyclopedia Record: 'Uruq Bani Ma'arid

'Uruq Bani Ma'arid is a protected area in southern Saudi Arabia, located on the western edge of the Rub' al Khali, the largest sandy desert in the world. The protected area is divided into three sections; a core nature reserve; a zone where controlled grazing is permitted; and a hunting zone.

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IUCN World Heritage Outlook

The 2025 Conservation Outlook on ‘Uruq Bani Ma’arid reports the following assessment:

Source: International Union for Conservation of Nature (IUCN) · View assessment