World Heritage Identification Number: 1455
World Heritage since: 2015
Category: Cultural Heritage
WHE Type: Archaeological Sites
Transboundary Heritage: No
Endangered Heritage: No
Country: 🇮🇷 Iran (Islamic Republic of)
Continent: Asia
UNESCO World Region: Asia and the Pacific
Map
Susa: An Archaeological Treasure Trove in Southwestern Iran
Susa, located in the south-west of Iran, is a remarkable archaeological site that offers a unique glimpse into the rich cultural history of the region. Inscribed as a UNESCO World Heritage Site in 2015, this ancient city, nestled in the lower Zagros Mountains, has been a significant center of civilization for over 4,500 years.
More to come…UNESCO Description of the World Heritage Site
Located in the south-west of Iran, in the lower Zagros Mountains, the property encompasses a group of archaeological mounds rising on the eastern side of the Shavur River, as well as Ardeshir’s palace, on the opposite bank of the river. The excavated architectural monuments include administrative, residential and palatial structures. Susa contains several layers of superimposed urban settlements in a continuous succession from the late 5th millennium BCE until the 13th century CE. The site bears exceptional testimony to the Elamite, Persian and Parthian cultural traditions, which have largely disappeared.
UNESCO Justification of the World Heritage Site
Criterion (i): Susa stands as one of the few ancient sites in the Middle East where two major social and cultural developments took place: the development of the early state, and urbanization. Susa is among the few sites in the Middle East where the dynamics and processes that led to these monumental human achievements has been documented, and still holds a huge body of important tangible evidence to understand better the early and mature stages of social, cultural and economic complexity. In its long history, Susa contributed to the development of urban planning and architectural design. The royal ensemble of the Palace of Darius and Apadana, with its tall hypostyle hall and porticos, lofty stone columns and gigantic capitals and column bases, and the orthostatic and ceramic wall decorations, together represent an innovative contribution to the creation of a new expression, characteristic of the Achaemenid Empire.
Criterion (ii): The proto-urban and urban site of Susa bears testimony, from the late 5th millennium BCE to the first millennium CE, to important interchanges of influences, resulting from ancient trade connections and cultural exchanges between different civilizations, namely the Mesopotamian and Elamite. Susa has been identified as the focal point of interaction and intersection between the nomadic and sedentary cultures. It played a key role in creating and expanding technological knowledge, and artistic, architectural and town planning concepts in the region. Through its sustained interaction with nearby regions, archaeological and architectural materials discovered at Susa exhibit a variety of styles and forms, shedding light on an international ancient city that both influenced and was imitated by its neighbours.
Criterion (iii): The remains of the ancient city of Susa bear exceptional testimony to successive ancient civilizations during more than six millennia, as well as having been the capital city of the Elamite and Achaemenid Empires. It contains 27 layers of superimposed urban settlements in a continuous succession from the late 5th millennium BCE until the 13th century CE. Susa is on the most ancient of the sites, where the processes of urbanization crystallized in the late 5th millennium BC. A decade of scientific excavations from 1968 to 1978, and philological works at Susa, also documented the development and changing character of this early urban centre throughout the millennia.
Criterion (iv): Susa is an outstanding and rare example of a type of urban settlement representing the beginnings of urban development in the proto-Elamite and Elamite periods, from the late fifth millennium BCE. Furthermore, from the sixth century BCE, as the administrative capital city of the Achaemenid Empire, Susa contributed to the creation of a new prototype of ceremonial architecture, which became a characteristic feature of the Iranian Plateau and its neighbouring lands.
Encyclopedia Record: Susa
Susa was an ancient city in the lower Zagros Mountains about 250 km (160 mi) east of the Tigris, between the Karkheh and Dez Rivers in Iran. One of the most important cities of the Ancient Near East, Susa served as the capital of Elam and the winter capital of the Achaemenid Empire, and remained a strategic centre during the Parthian and Sasanian periods.Additional Site Details
Area: 350 hectares
Number of Components: 2
(ii) — Significant interchange of human values
(iii) — Unique or exceptional testimony to a cultural tradition
(iv) — Outstanding example of a type of building or landscape
Coordinates: 32.1894444444 , 48.2561111111
Image
© Carole Raddato from Frankfurt, Germany, CC BY-SA 2.0 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 Susa from its history and significance to its conservation, management, and contemporary challenges.
-
Tectonic relationships between the Paleozoic basement and the Mesozoic cover succession in the northern Dora-Maira Massif (Susa Valley, Western Alps)
A key insight into the multistage tectonic evolution of orogenic belts emerges from the northern Dora-Maira Massif, specifically within the UNESCO World Heritage Site at Susa. The study reveals that the Bussoleno Detachment Shear Zone, acting as a critical basement-cover interface, likely originated in the Early Triassic and localized deformation, predating Alpine polyphase deformation. This zone, along with the ophiolite-bearing Foresto Shear Zone, was deformed through four main phases (D1 to D4), with the early tectonic setting established during subduction-related D1 phase. The research utilizes a 1:5,000 scale geological map to elucidate these complex tectonic relationships, offering a deeper understanding of how detachment zones influence orogenic processes.
Balestro, G., Gattiglio, M., Roà, M., & Festa, A. (2025). Tectonic relationships between the Paleozoic basement and the Mesozoic cover succession in the northern Dora-Maira Massif (Susa Valley, Western Alps). Journal of Maps, 21(1). https://doi.org/10.1080/17445647.2025.2451785
View Publication Record | Read Publication -
Mineralogical and petrological constraints and tectonic implications of a new coesite-bearing unit from the Alpine Tethys oceanic slab (Susa Valley, Western Alps)
Researchers have identified a new Ultrahigh Pressure (UHP) oceanic unit in the Susa Valley, Western Alps, marked by the presence of coesite—a rare mineral indicating extreme pressure conditions. This discovery, analyzed through Raman spectroscopy and thermometry, suggests that the region once experienced subduction to mantle depths, similar to other UHP units like Lago di Cignana and Lago Superiore. The findings imply a previously underestimated extent of UHP oceanic slices in the Western Alps, challenging models of localized pressure and supporting the idea of a dismembered slab during exhumation.
Ghignone, S., Gilio, M., Borghini, A., Boero, F., Bruno, M., & Scaramuzzo, E. (2024). Mineralogical and petrological constraints and tectonic implications of a new coesite-bearing unit from the Alpine Tethys oceanic slab (Susa Valley, Western Alps). Lithos, 472-473, 107575. https://doi.org/10.1016/j.lithos.2024.107575
View Publication Record | Read Publication -
Post-wildfire erosion rates and triggering of debris flows: A case study in Susa Valley (Bussoleno)
Post-wildfire erosion rates can increase by more than 20 times, significantly raising the risk of debris flows and floods. A study in Susa Valley, Italy, applied a modified version of the RUSLE model on GIS to quantify these changes, leveraging high-resolution rainfall data and field surveys. The research found that the Erodibility Index (EI), monthly soil loss (A), and sediment loss (SL) all rose dramatically post-fire, with the highest erosion occurring in April, May, and June. This surge is attributed to a more than one-order magnitude increase in the Erodibility Index compared to pre-fire conditions. The findings highlight the severe impact of wildfires on geological hazards in Alpine regions, where such events are not typically expected.
Mandrone, G., Vacha, D., & Chicco, J. (2023). Post-wildfire erosion rates and triggering of debris flows: A case study in Susa Valley (Bussoleno). E3S Web of Conferences, 415, 4009. https://doi.org/10.1051/e3sconf/202341504009
View Publication Record | Read Publication -
Comparative Study of Architectural Bricks from Khorsabad and Susa Sites: Characterization of Black Glazes
A comparative analysis of black glazes on architectural bricks from Susa and Khorsabad reveals distinct coloring techniques between the Neo-Assyrian (Khorsabad) and Achaemenid Persian (Susa) periods. At Susa, black glaze composition varies by function: manganese oxide for colored fields and iron-rich compounds for raised lines separating glazed areas. In contrast, Khorsabad's black glazes contain spherical copper sulfide and galena nanoparticles, a rare technique with poorly understood formation mechanisms. The study employed optical microscopy, SEM-EDX, synchrotron µ-XRD, and µ-Raman spectroscopy to characterize these glazes, offering new insights into ancient brick manufacturing processes.
Beauvoit, E., Bouquillon, A., Majérus, O., Caurant, D., Cuny, J., & Thomas, A. (2023). Comparative Study of Architectural Bricks from Khorsabad and Susa Sites: Characterization of Black Glazes. Heritage, 6(9), 6291–6310. https://doi.org/10.3390/heritage6090329
View Publication Record | Read Publication -
Traditional Knowledge Evolution over Half of a Century: Local Herbal Resources and Their Changes in the Upper Susa Valley of Northwest Italy
A significant decline in traditional medicinal plant knowledge and usage has been observed in the Susa Valley, Italy, over the past 50 years. This study, comparing data from 2018 with a 1970 survey, documented 36 species—21 for medical purposes and 15 as food-medicines—highlighting a loss of ethnobotanical practices likely due to socioeconomic and cultural shifts. Promising species like Taraxacum officinale, Urtica dioica, and Artemisia genipi were identified for potential future use in nutraceuticals, food, and medicine. The research employed 30 semi-structured interviews to capture current practices, offering insights into the erosion of traditional ecological knowledge in mountainous regions.
Sulaiman, N., Zocchi, D. M., Borrello, M. T., Mattalia, G., Antoniazzi, L., Berlinghof, S. E., Bewick, A., Häfliger, I., Schembs, M., Torri, L., & Pieroni, A. (2023). Traditional Knowledge Evolution over Half of a Century: Local Herbal Resources and Their Changes in the Upper Susa Valley of Northwest Italy. Plants, 13(1), 43. https://doi.org/10.3390/plants13010043
View Publication Record | Read Publication -
Zerynthia polyxenaLocally Monophagous onAristolochia pallidain the Susa Valley
Research reveals that the protected butterfly Zerynthia polyxena exhibits local monophagy on Aristolochia pallida in the Susa Valley, despite being oligophagous across Europe. While larvae of Z. polyxena thrive and develop similarly on A. clematitis and A. rotunda until the third larval stage, only those fed with A. pallida successfully reach the pupal stage. This finding underscores the importance of understanding local host plant preferences for designing effective conservation strategies for protected Lepidoptera species. The study employed controlled laboratory conditions to investigate oviposition choices and larval development, providing critical insights into the ecological specificity of this butterfly.
Piccini, I., Di Pietro, V., & Bonelli, S. (2021). Zerynthia polyxenaLocally Monophagous onAristolochia pallidain the Susa Valley. Environmental Entomology, 50(6), 1425–1431. https://doi.org/10.1093/ee/nvab082
View Publication Record | Read Publication -
HP tectono‐metamorphic evolution of the Internal Piedmont Zone in Susa Valley (Western Alps): New petrologic insight from garnet+chloritoid‐bearing micaschists and Fe–Ti metagabbro
A new study reveals that the subduction of the Tethys oceanic lithosphere in the Western Alps occurred under similar high-pressure (HP) and ultra-high-pressure (UHP) conditions, as evidenced by garnet+chloritoid-bearing micaschists and Fe–Ti metagabbro from Susa Valley. The research identifies four distinct metamorphic stages, including an Alpine peak-P stage reaching HP-UHP eclogite facies boundary (25–29 kbar, 460–510°C), followed by decompression under eclogite facies conditions and later greenschist facies re-equilibration. The inferred P–T path aligns with other Western Alpine meta-ophiolites, suggesting a consistent subduction regime along the Tethys lithosphere's length. Comparison with adjacent Dora Maira continental crustal units indicates early exhumation likely occurred within the subduction channel without continental crust buoyancy contribution.
Ghignone, S., Borghi, A., Balestro, G., Castelli, D., Gattiglio, M., & Groppo, C. (2020). HP tectono‐metamorphic evolution of the Internal Piedmont Zone in Susa Valley (Western Alps): New petrologic insight from garnet+chloritoid‐bearing micaschists and Fe–Ti metagabbro. Journal of Metamorphic Geology, 39(4), 391–416. Portico. https://doi.org/10.1111/jmg.12574
View Publication Record | Read Publication
