Greek Military Camp Found on Alexander’s Eastern Frontier

The hilltop in southern Uzbekistan had been catalogued as a small rural settlement. It was modest, unremarkable, another tepa on a landscape scattered with them. Archaeologists had visited, noted Hellenistic-period material, and moved on with questions unanswered. Then a research team from Charles University returned with geophysical instruments and changed what the site was.

What magnetometry and ground-penetrating radar revealed beneath the surface was not a village. It was an enclosing ditch nearly 400 metres long, running in an oval around the hilltop, cutting off a defended area of about 1.2 hectares. The evidence, researchers argue, points to a Hellenistic military camp sitting on the borderland between two ancient worlds, and it had been hidden from view for more than two thousand years.

A Promontory Above the Loylagan Valley

Iskandar Tepa sits in the Sherobod District of Surkhan Darya Province in southern Uzbekistan, roughly 20 metres above the floor of the Loylagan valley. From its narrow promontory, the hilltop commands a clear view of a small oasis landscape in the borderlands between ancient Bactria to the south and Sogdiana to the north: two of the most contested regions in the eastern reaches of Alexander the Great’s conquests.

The site was first identified in 2017 by a Czech-Uzbek archaeological team. Early excavations confirmed occupation from the Hellenistic period, but the internal layout of the site remained unclear, and nothing visible on the surface suggested a military installation. The question of what the site had actually been remained open.

What Geophysics Found Underground

The new study, led by Ladislav Stančo of Charles University with colleagues Jan Kysela, Tomáš Tencer, Peter Milo, and Shapulat Shaydullaev, applied magnetometry and ground-penetrating radar across the hilltop. The instruments produced a result invisible from the ground and undetectable in satellite imagery: a large oval anomaly encircling the summit.

Targeted excavations confirmed it was a ditch. In one trench, the feature measured about 7 metres wide and 85 centimetres deep. In another, it was about 4 metres wide and roughly 1 metre deep. On the inner side of the ditch, researchers also found regularly spaced postholes, consistent with a wooden palisade that once ran along the interior edge of the enclosure.

The camp contained no substantial internal architecture. No stone buildings. No permanent structures. What the ditch enclosed was a controlled, temporary space: a defensible hilltop prepared for occupation rather than long-term settlement. The absence of permanent construction is itself a clue about how the site was used and by whom.

The Problem of Water

Inside the enclosure, the team found large ceramic storage vessels known locally as khums, buried upright in the ground. Many had already been noticed in earlier excavations, but the geophysical survey showed how widespread they were across the site. Several had white calcareous deposits on their walls and bases, consistent with liquid storage. Attempts to recover plant material from the jars produced nothing useful, leading the researchers to suggest that water was the most likely contents.

The logic of that interpretation is straightforward. Iskandar Tepa has no known spring or well at the summit. Any group stationed here would have had to bring water from the valley below, collect rainwater, or channel it from somewhere. A linear feature along the northern slope was interpreted as a possible canal that may have carried water toward the hilltop from a distance.

For a military camp in a semi-arid landscape, water storage was not optional. The buried jars suggest the occupation was planned carefully, not improvised. Someone thought about what it would take to hold this position.

Coins and the Greco-Bactrian World

Dating at Iskandar Tepa comes from pottery and, most precisely, from coins recovered during surface survey. These include coins of Diodotus II, Euthydemus I, and Demetrius I, all rulers of the Greco-Bactrian kingdom, the Greek-speaking state that controlled parts of Central Asia after Alexander’s conquests. The main occupation falls most likely in the 2nd century BCE, with possible use continuing into the 1st century BCE.

The name Iskandar Tepa translates loosely as “Alexander’s Mound” in local tradition, and the figure of Alexander runs through the site’s story as a point of origin rather than a point of presence. The camp was not necessarily used by Alexander’s own army, which had campaigned through the region in the 320s BCE. Its importance lies in what came after: the Greco-Bactrian rulers who inherited and maintained the Greek military systems Alexander had introduced, and who still needed to garrison, patrol, and defend a frontier zone more than a century after his death.

The coins date the site not to Alexander’s campaign but to the world his conquests made possible.

From Camp to Cemetery

The hilltop did not stand empty after its military phase ended. Geophysical survey detected nearly 90 oval pits grouped in eastern and western clusters around the edges of the site. Researchers interpret these as burial pits belonging to a later period, roughly the 1st century BCE to 1st century CE, during the Transitional or Yuezhi period, when Bactria was passing out of Greco-Bactrian control and into a new phase of Central Asian history.

In some places, the burial activity overlapped with earlier settlement features, suggesting that later communities reused the abandoned camp as a place for their dead. A site that soldiers had once occupied as a living, temporary space became, generations later, a place for the permanent installation of the deceased. The hilltop kept its significance even as the culture using it changed completely.

Why Military Camps Disappear

Temporary military camps are among the hardest archaeological signatures to recognize. They do not leave temples, colonnades, or stone fortifications. A ditch can be filled or eroded over centuries. Wooden palisades rot without leaving visible traces. Storage jars survive only as buried anomalies, detectable only if someone thinks to look with the right instruments.

Without geophysical survey, Iskandar Tepa would still appear to be a modest rural settlement of uncertain significance. The combination of its elevated position, the enclosed ditch, the possible palisade, the absence of permanent architecture, and the evidence of deliberate water management all support the military camp interpretation. The researchers compare it with Boysari Tepa in central Sogdiana, a comparable fortified elevated site from the same period, and note that Greek and Hellenistic military practice routinely favoured naturally defended hilltops, irregular or circular enclosures, and limited permanent construction in frontier zones.

At Iskandar Tepa, that combination of features had been sitting in plain sight on a hilltop in the Loylagan valley, unrecognized for what it was, until instruments designed for a different kind of looking made the invisible ditch visible again.

The Frontier That Outlasted Its Founders

Alexander the Great moved through Bactria and Sogdiana at extraordinary speed, fighting some of the most difficult campaigns of his career against the guerrilla resistance of local rulers. He founded cities and established garrisons, then moved on. What he left behind was a political and military framework that his successors would spend generations trying to maintain.

Iskandar Tepa is one small piece of evidence for what that maintenance looked like on the ground. A hilltop with a view. A ditch cut into the rock. Jars buried in the earth and filled with water carried up from the valley below. Soldiers stationed at the edge of a world that stretched, improbably, from Macedonia to the borders of India.

They left almost nothing. Geophysics found what remained.

Sources

Stančo, L., Kysela, J., Tencer, T., Milo, P., & Shaydullaev, S. (2026). Geophysical and archaeological survey of the Hellenistic-period settlement Iskandar Tepa in the Bactro-Sogdian borderlands. Journal of Archaeological Science: Reports, 72, Article 105742. https://doi.org/10.1016/j.jasrep.2026.105742