A team of archaeologists discovered a complex underground drainage installation at a spring in Oymaağaç Höyük, in the central Black Sea region of Turkey. This site, identified as the ancient Hittite city of Nerik, has revealed a water control infrastructure dating back to the Bronze Age, between 1525 and 1426 BCE, according to dendrochronological and radiocarbon studies conducted by the Balkan-Aegean Dendrochronology Project (BAD Project).

Work at Oymaağaç Höyük began in 2009 and continued until 2019, uncovering an impressive underground complex consisting of a long staircase leading to a chamber with an artificial spring, located approximately nine meters below the current ground level.

Thanks to the anoxic conditions of the subsoil, a large number of wooden artifacts were found in an exceptional state of preservation. Among them, a drainage structure made of pine wood stands out, designed to control the flow of water within the chamber.

hitite nerik engineering
Entrance to the LBA underground construction complex of Oymaağaç Höyük/Nerik during the initial stages of its excavation in 2010. Credit: H. Marquardt / Oymaağaç Project

Archaeologists have determined that this structure was composed of two rectangular wooden blocks, tightly fitted into the chamber wall, with a perforated log inside that served as a water conduit. This represents evidence of the sophisticated water management of the Hittite civilization.

To determine the exact age of the installation, researchers from the BAD Project conducted a detailed analysis of the wood’s growth rings, complemented by radiocarbon dating. The methodology used allowed them to refine the construction date to between 1525 and 1426 BCE, confirming that the structure belongs to the Late Hittite period.

Despite challenges in correlating it with preexisting dendroarchaeological chronologies, this discovery constitutes a key reference for future research on architecture and urban planning in prehistoric Anatolia. Furthermore, it highlights the need to expand dendrochronological studies in the region, as the available pine chronologies for this period are limited.

hitite nerik engineering
Section of the photogrammetric documentation of the LBA underground construction complex of Oymaağaç Höyük/Nerik with its entrance, staircase and spring chamber representing the state of research at the end of the excavation season in 2019. Credit: M. Lehmann / Oymaağaç Project

Nerik, the city where this discovery was made, was an important religious center of the Hittites, linked to the cult of the storm god. Its location in northern Anatolia made it a strategic enclave, frequently contested between the Hittites and the Kaskas, a rival group from the region.

The fact that the drainage installation was built during a period when the Hittites faced difficulties maintaining control of the area suggests that Nerik may have undergone significant urban renewal to consolidate its religious and political importance.

The discovered structure may have played a fundamental role in ensuring access to potable water, a critical resource in times of instability.

hitite nerik engineering
Dendroarchaeological sampling spots on the LBA wooden water-drain installation of the spring chamber of Oymaağaç Höyük/Nerik. Credit: D.P. Mielke / Oymaağaç Project

The discovery at Oymaağaç Höyük represents a significant advancement in understanding hydraulic engineering practices in the Bronze Age. At the same time, it raises new questions about the evolution of Hittite urbanism and the use of local materials for constructing essential infrastructure.

Researchers hope that this finding will drive new studies in the region, allowing for the creation of more complete and precise dendrochronological timelines.

Likewise, they emphasize the importance of preserving these archaeological sites, which offer a unique window into the past and the civilizations that laid the foundations of modern societies.


SOURCES

Y. Özarslan, D.P. Mielke, et al., Tree-ring analysis and absolute dating of a wooden water-drain installation from the Late Bronze Age underground spring chamber of Oymaağaç Höyük/Nerik, Türkiye. Journal of Archaeological Science: Reports, Volume 62, April 2025, 105058. doi.org/10.1016/j.jasrep.2025.105058


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