World Heritage Identification Number: 1563
World Heritage since: 2018
Category: Cultural Heritage
WHE Type: Cultural Landscapes
Transboundary Heritage: No
Endangered Heritage: No
Country: 🇸🇦 Saudi Arabia
Continent: Asia
UNESCO World Region: Arab States
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Al-Ahsa Oasis: An Enduring Testament to Human Adaptation and Resilience
The Al-Ahsa Oasis, a sprawling expanse of verdant greenery nestled within the arid landscapes of eastern Saudi Arabia, stands as a testament to human ingenuity and resilience. Inscribed as a UNESCO World Heritage Site in 2018, this evolving cultural landscape offers a captivating glimpse into the rich history, culture, and environmental adaptations that have shaped the Gulf region over millennia.
More to come…UNESCO Description of the World Heritage Site
In the eastern Arabian Peninsula, the Al-Ahsa Oasis is a serial property comprising gardens, canals, springs, wells and a drainage lake, as well as historical buildings, urban fabric and archaeological sites. They represent traces of continued human settlement in the Gulf region from the Neolithic to the present, as can be seen from remaining historic fortresses, mosques, wells, canals and other water management systems. With its 2.5 million date palms, it is the largest oasis in the world. Al-Ahsa is also a unique geocultural landscape and an exceptional example of human interaction with the environment.
UNESCO Justification of the World Heritage Site
Criterion (iii): The continuity of the oasis agricultural tradition is represented by an organically evolved cultural landscape with an agricultural organization based upon the distribution of the spring water through a network of open-air canals. Al-Ahsa Oasis cultural landscape materializes the vivacity and modernity of this specific land-use tradition and shows its continuing relevance at the local and regional scale.
Criterion (iv): This large cultural landscape is composed of different zones covering the oasis’ gardens, mountains, caves, villages, mosques and springs, but also archaeological sites and a small section of the historic centre of Al-Hofuf with the main monuments embodying the political control over the area and its commercial role throughout the past centuries. The vestiges of the villages, fortresses, mosques, markets and houses, though often in a ruinous shape, preserve a complete catalogue of the architectural elements composing the urban settlement of Al-Ahsa from the early Islamic period to the Saudi Kingdom.
Criterion (v): The oasis is an outstanding example of traditional human settlement developed in a desert environment exemplifying the intimate link between landscape, natural resources and the human efforts to settle the land. The rich water table close to the surface permitted the growth of a large oasis settlement. Water was originating from surface springs and drawn from wells reaching the shallow water table. Some of these springs and wells are still visible in the site, living memory of the traditional farming techniques.
Encyclopedia Record: Al-Ahsa Oasis
Al-Ahsa Oasis, also known as al-Ḥasāʾ (الْحَسَا) or Hajar (هَجَر), is an oasis and historical region in eastern Saudi Arabia. Al-Ahsa Governorate, which makes up much of the country's Eastern Province, is named after it. The oasis is located about 60 km inland from the coast of the Arabian Gulf. Al-Ahsa Oasis comprises four main cities and 22 villages. The cities include Al-Mubarraz and Al-Hofuf, two of the largest cities in Saudi Arabia.Additional Site Details
Area: 8,544 hectares
Number of Components: 12
(iv) — Outstanding example of a type of building or landscape
(v) — Outstanding example of traditional human settlement
Coordinates: 25.4021666667 , 49.6305694444
Image
© Aqeel Khalid, CC BY-SA 4.0 Resized from original. (This derivative is under the same CC BY-SA license.)
World Heritage Research
Discover scientific research and academic studies that deepen our understanding of Al-Ahsa Oasis, an Evolving Cultural Landscape from its history and significance to its conservation, management, and contemporary challenges.
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Assessment of vegetation cover changes and the contributing factors in the Al-Ahsa Oasis using Normalized Difference Vegetation Index (NDVI)
A significant improvement in the ecological environment of Al-Ahsa Oasis, Saudi Arabia, has been observed from 1987 to 2021, with a notable increase in vegetation cover. This was evidenced by an increase in Normalized Difference Vegetation Index (NDVI) values exceeding 0.10, particularly in the 'green' zones where NDVI values surpassed 0.40. The study, using Landsat satellite images and ground validation points, found that while low NDVI areas remained stable, high NDVI regions expanded, especially in northern and southern parts of the oasis from 2002 to 2021. High accuracy (92%) was achieved in detecting vegetation cover changes. The research suggests that strengthening forestry projects could help combat sand encroachment and further enhance the oasis's ecological environment.
Chouari, W. (2024). Assessment of vegetation cover changes and the contributing factors in the Al-Ahsa Oasis using Normalized Difference Vegetation Index (NDVI). Regional Sustainability, 5(1), 100111. https://doi.org/10.1016/j.regsus.2024.03.005
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Mapping Groundwater Potential (GWP) in the Al-Ahsa Oasis, Eastern Saudi Arabia Using Data-Driven GIS Techniques
A groundbreaking study identifies key factors influencing groundwater potential (GWP) in the Al-Ahsa Oasis, Saudi Arabia, using advanced GIS techniques. The research reveals that soil texture and geology are the most significant parameters for GWP mapping, while lineament density is the least influential. Nearly 45–48% of the oasis falls within moderate GWP zones, with 21–37% classified as high potential. Two weighted overlay methods—simple additive weight (SAW) and optimum index factor (OIF)—were employed to validate findings against existing wells, confirming the accuracy of the SAW map. The OIF method further pinpointed optimal parameter combinations for GWP delineation, including land cover, topographic wetness index, and lineament density. This study offers a scalable model for sustainable water resource management in arid regions, with implications for global groundwater conservation efforts.
Hassaballa, A., & Salih, A. (2024). Mapping Groundwater Potential (GWP) in the Al-Ahsa Oasis, Eastern Saudi Arabia Using Data-Driven GIS Techniques. Water, 16(2), 194. https://doi.org/10.3390/w16020194
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Tourist Values and Well-Being in Rural Tourism: Insights from Biodiversity Protection and Rational Automobile Use in Al-Ahsa Oasis, Saudi Arabia
A study on Al-Ahsa Oasis, Saudi Arabia, reveals that pro-environmental behaviors—such as biodiversity protection and rational automobile use—significantly enhance tourists' well-being and altruistic values. Using partial least structural equation modeling on survey data from 309 farm tourists, researchers found that protecting biodiversity positively influences altruistic values and tourist well-being, while rational car use boosts both altruistic and biospheric values. These insights underscore the potential for sustainable tourism to foster environmental consciousness and personal well-being, offering actionable strategies for future conservation and tourism initiatives in UNESCO-listed cultural landscapes.
AlAli, A. M., Hassan, T. H., & Abdelmoaty, M. A. (2024). Tourist Values and Well-Being in Rural Tourism: Insights from Biodiversity Protection and Rational Automobile Use in Al-Ahsa Oasis, Saudi Arabia. Sustainability, 16(11), 4746. https://doi.org/10.3390/su16114746
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A Spatio-Temporal Analysis of Heat Island Intensity Influenced by the Substantial Urban Growth between 1990 and 2020: A Case Study of Al-Ahsa Oasis, Eastern Saudi Arabia
A significant link between urbanization and heat island (UHI) intensity was identified at Al-Ahsa Oasis, Saudi Arabia, despite no marked increase in UHI temperature over 30 years. The study found that while built-up areas expanded from 17.15% to 45.8% of land use/cover between 1990 and 2020, UHI intensity remained relatively stable (10.4 °C in 1990 vs. 8.7 °C in 2020). Hot spot clustering correlated with dense urban areas, while cold spots aligned with date and palm tree regions, both with 99% confidence. Spatial autocorrelation further confirmed the temperature-urbanization relationship, with Moran’s indices of 0.41 (1990) and 0.45 (2020), and a p-value of 0.001. The research employed change detection, hot spot analysis, and spatial autocorrelation to robustly assess UHI dynamics.
Hassaballa, A., & Salih, A. (2023). A Spatio-Temporal Analysis of Heat Island Intensity Influenced by the Substantial Urban Growth between 1990 and 2020: A Case Study of Al-Ahsa Oasis, Eastern Saudi Arabia. Applied Sciences, 13(5), 2755. https://doi.org/10.3390/app13052755
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An Assessment of Irrigation Water Quality with Respect to the Reuse of Treated Wastewater in Al-Ahsa Oasis, Saudi Arabia
A significant portion of irrigation water in Al-Ahsa Oasis, Saudi Arabia, is suitable for agricultural use despite high salinity and sodium hazards. The study found that 62.1% of the samples were satisfactory (class IV) for irrigation, while 33.8% faced severe restrictions. Treated wastewater mixed with groundwater proved acceptable, though spatial variations in water quality were noted, with agricultural drainage showing higher levels of contaminants. The research used irrigation water quality indices (IWQIs) to assess 148 samples, revealing that 79.7% had high to very high salinity hazards and medium to high sodium hazards. Regular monitoring of treated wastewater quality is crucial for sustainable reuse in irrigation and food security.
Badr, E.-S. A., Tawfik, R. T., & Alomran, M. S. (2023). An Assessment of Irrigation Water Quality with Respect to the Reuse of Treated Wastewater in Al-Ahsa Oasis, Saudi Arabia. Water, 15(13), 2488. https://doi.org/10.3390/w15132488
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Contamination and health risk assessment of potentially toxic elements in agricultural soil of the Al-Ahsa Oasis, Saudi Arabia using health indices and GIS
A study on the Al-Ahsa Oasis, Saudi Arabia, reveals that while potentially toxic elements (PTEs) such as iron, manganese, and zinc are present in agricultural soils, they pose no significant non-carcinogenic or carcinogenic health risks to residents. Using health indices like hazard quotient (HQ), hazard index (HI), cancer risk (CR), and total lifetime cancer risk (LCR), researchers found that children's exposure via ingestion is approximately nine times higher than adults', but the overall risk remains low. Spatial distribution analysis using GIS and multivariate techniques suggests natural sources for these elements, with no significant health hazards detected within acceptable carcinogenic risk thresholds.
Alharbi, T., El-Sorogy, A. S., & Al-Kahtany, K. (2024). Contamination and health risk assessment of potentially toxic elements in agricultural soil of the Al-Ahsa Oasis, Saudi Arabia using health indices and GIS. Arabian Journal of Chemistry, 17(3), 105592. https://doi.org/10.1016/j.arabjc.2023.105592
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Analyzing the Spatial Correspondence between Different Date Fruit Cultivars and Farms’ Cultivated Areas, Case Study: Al-Ahsa Oasis, Kingdom of Saudi Arabia
A significant spatial correspondence exists between date palm (DP) cultivars and cultivated areas within farms in Al-Ahsa Oasis, Saudi Arabia. The study reveals that most DP farms cover less than 500 m², with larger plantations concentrated in the northern and central subregions, aligning with tree distribution patterns. Khlas emerged as the dominant cultivar, present in nearly all farms (96.9%), unlike Ruziz and Shishi, which were absent from 31.9% and 37.8% of farms, respectively. Spatial analysis also linked DP plantations to soil and irrigation water salinity variations, underscoring the need for targeted agricultural programs. This research provides critical insights for date palm sustainability, benefiting growers, authorities, and policymakers.
Ismail, A. I. H., Hassaballa, A. A., Almadini, A. M., & Daffalla, S. (2022). Analyzing the Spatial Correspondence between Different Date Fruit Cultivars and Farms’ Cultivated Areas, Case Study: Al-Ahsa Oasis, Kingdom of Saudi Arabia. Applied Sciences, 12(11), 5728. https://doi.org/10.3390/app12115728
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Applications of Electromagnetic Induction and Electrical Resistivity Tomography for Digital Monitoring and Assessment of the Soil: A Case Study of Al-Ahsa Oasis, Saudi Arabia
Modern geophysical techniques, including electromagnetic induction and electrical resistivity tomography, reveal significant variations in soil salinity and texture at Al-Ahsa Oasis, Saudi Arabia. These findings highlight the impact of factors such as soil type, moisture content, and sabkha on agricultural productivity, offering critical insights for sustainable farming practices. The study utilized ten 2-D electrical tomography profiles and twenty electromagnetic conductivity measurements across 12,000 hectares of cultivated land, identifying distinct geoelectric units that reflect diverse hydrogeological conditions. This research provides actionable data for farmers, development sectors, and research institutions to address groundwater depletion and soil salinity issues, ensuring the long-term sustainability of this historic oasis.
Mohammed, M., El Mahmoudi, A., & Almolhem, Y. (2022). Applications of Electromagnetic Induction and Electrical Resistivity Tomography for Digital Monitoring and Assessment of the Soil: A Case Study of Al-Ahsa Oasis, Saudi Arabia. Applied Sciences, 12(4), 2067. https://doi.org/10.3390/app12042067
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Risk Assessment of Potentially Toxic Elements in Agricultural Soils of Al-Ahsa Oasis, Saudi Arabia
A risk assessment of potentially toxic elements (PTEs) in Al-Ahsa Oasis, Saudi Arabia, reveals that while most PTE levels remain below maximum admissible concentrations, certain areas exhibit significant enrichment and ecological risks. Mercury (Hg), arsenic (As), and cadmium (Cd) show notable anthropogenic sources, likely linked to fertilizer and insecticide use, whereas other elements like zinc (Zn), chromium (Cr), nickel (Ni), copper (Cu), lead (Pb), and nickel (Ni) originate primarily from natural crustal materials. The study analyzed 30 soil samples from palm fields irrigated with groundwater and treated sewage water, employing contamination indicators and multivariate methods to assess environmental risks. Satellite imagery also documented changes in vegetative and residential areas between 1985 and 2021.
Alharbi, T., & El-Sorogy, A. S. (2022). Risk Assessment of Potentially Toxic Elements in Agricultural Soils of Al-Ahsa Oasis, Saudi Arabia. Sustainability, 15(1), 659. https://doi.org/10.3390/su15010659
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Using of Triple-Treated Wastewater in Agricultural Irrigation in Al-Ahsa Oasis, Saudi Arabia.
Agricultural productivity in Al-Ahsa Oasis, Saudi Arabia, significantly increased by 16.8% to 19.2% when palm and lemon crops were irrigated with triple-treated wastewater compared to groundwater. This study, based on a random sample of 355 farms, found a statistically significant positive correlation between the use of treated wastewater and factors such as farm size, family size, and farmer education level. Conversely, there was a negative correlation with the age and experience of farmers. The research highlights the economic potential and environmental benefits of using triple-treated wastewater in agriculture, addressing the high water consumption demands of the sector.
El-Sebaei, M. N., Osman, R. T., Mansour, H. E. H., & Al-Asmari, M. A. (2021). USING OF TRIPLE-TREATED WASTEWATER IN AGRICULTURAL IRRIGATION IN AL-AHSA OASIS, SAUDI ARABIA. Iraqi Journal of Agricultural Sciences, 52(6), 1516–1527. https://doi.org/10.36103/ijas.v52i6.1493
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