Habitats
AlUla’s landscapes are classified into six habitat groups, each made up of several habitats. Select a group to discover its habitats, vegetation and characteristic plants.
Volcanics
The Volcanics habitats encompass the range of landforms associated with the volcanic features of AlUla. These harrat systems form some of the largest continuous volcanic fields in Arabia and define much of the regional landscape character. Their varied topography and generally higher elevations create in places cooler, more sheltered microenvironments that act as important refugia for specialised plant and animal communities.
Sandstone Landforms
Sandstone landforms comprise extensive sandstone plateaus, inselbergs, buttes, mesas, cliffs, and associated slopes that dominate large parts of eastern and northeastern AlUla. These landscapes are defined by exposed sandstone bedrock shaped by long-term erosion, resulting in a strongly dissected terrain of high relief and distinctive rock forms.In central AlUla, the dominant bedrock is the Siq Sandstone, which is very well cemented, red due to high iron content, and heavily fractured. These are hard blocky sandstones creating large ridges, or mesa. In central AlUla and moving towards the north, the lighter, Quweria Sandstone is exposed creating a mixture of sandstone formations and sandy plains and dunes. The Saq Sandstone lies to the north and north east, with hard iron beds exposed, interspersed with pebble gravel plains and accumulations of fine sandy plains.Sandstone landforms provide the physical framework for a range of associated habitats, including outcrops, boulder slopes, screes, and canyons. Shallow soils and variable exposure lead to patchy vegetation cover, while shaded cliffs, ledges, and sheltered slopes form important refugia for specialised and locally restricted species. Collectively, these landforms constitute a key structural component of the AlUla landscape, contributing strongly to its ecological diversity, visual character, and natural and cultural heritage.
Sandy Plains and Dunes
The sandy plains and dunes habitats encompasses the extensive sand-dominated landscapes of eastern AlUla, along with smaller patches distributed across the wider county. These deposits originate from a mix of geomorphological processes and long-distance aeolian transport. Surface stability varies widely: sandy plains typically form gently undulating, semi-stable terrain, while deeper accumulations develop where sand becomes trapped against natural barriers such as sandstone buttes, wadi margins, or topographic features.Vegetation structure reflects this variability. Sandy plains commonly support open dwarf shrubland dominated by drought-tolerant shrubs and grasses, while deeper or more mobile sands support more specialised dune vegetation, including open shrubland and, in some areas, very open Haloxylon persicum woodland. These habitats form a key ecological matrix linking sandstone landforms, wadis, and gravel plains, supporting flora and fauna characteristic of sandy desert systems.
Mountains and Associated Plains
The Mountains and associated plains comprise the Hijaz mountain systems of AlUla and their adjoining foothill and gravel plain environments. It spans a broad altitudinal gradient from rugged upland summits and steep slopes to lower foothills and depositional lowland plains.The mountain landscapes are formed predominantly from Precambrian crystalline rocks of the Arabian Shield, creating rugged, dissected terrain with extensive areas of exposed bedrock and shallow soils. In contrast, the associated plains are composed of gravel and alluvial deposits derived from long-term erosion and downslope transport of mountain material.Vegetation structure transitions from montane shrublands at high altitude to open Vachellia woodlands and perennial grasslands on foothills and plains.High-altitude areas form a distinct ecological zone within AlUla, functioning as climatic and topographic refugia. These areas support a distinct flora and fauna with a higher proportion of range-restricted and conservation-significant species compared to the surrounding lower altitude areas. In addition to supporting a high proportion of range-restricted vascular plants and fauna, they also provide important refugial habitat for bryophytes and other cryptogams.
Wadis and Ephemeral Flooded Depressions
Wadis comprise the network of ephemeral drainage systems across AlUla, ranging from small incised channels and tributaries to broad valley floors. They are shaped by episodic surface water flow following rainfall and act as major conduits for sediment, water, nutrients, and biological connectivity across the landscape.
Agricultural Lands
Agricultural lands comprise areas that are actively or recently managed for crop production, oases, or irrigated cultivation. These landscapes are strongly shaped by long-term human management, water abstraction, and soil modification, and form an important component of the cultural landscape of AlUla.Agricultural lands occur primarily within valley floors, oases, and low-lying plains where access to groundwater, springs, or surface water has enabled sustained cultivation.