First revealed in spy photos, a Bronze Age city emerges from the steppe

First revealed in spy photos, a Bronze Age city emerges from the steppe

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An all of a sudden big city depends on a sea of lawn occupied mainly by wanderers.

This bronze ax head was discovered in the western half of Semiyarka.


Credit: Radivojevic et al. 2025

Today all that’s left of the ancient city of Semiyarka are a couple of low earthen mounds and some spread artifacts, almost concealed underneath the waving turfs of the Kazakh Steppe, a huge swath of meadow that extends throughout northern Kazakhstan and into Russia. Current studies and excavations expose that 3,500 years back, this empty plain was a dynamic city with a growing metalworking market, where nomadic herders and traders may have socialized with settled metalworkers and merchants.

Radivojevic and Lawrence base on the website of Semiyarka.


Credit: Peter J. Brown

Invite to the City of Seven Ravines

University College of London archaeologist Miljana Radivojevic and her coworkers just recently mapped the website with drones and geophysical studies(like ground-penetrating radar, for instance), tracing the design of a 140-hectare city on the steppe in what’s now Kazakhstan.

The Bronze Age city as soon as boasted rows of homes developed on earthworks, a big main structure, and an area of workshops where craftsmens heated and cast bronze. From its windswept promontory, it held a commanding view of a narrow point in the Irtysh River valley, a tactical area that might have used the city “control over motion along the river and valley bottom,” according to Radivojevic and her associates. That view motivated archaeologists’ name for the city: Semiyarka, or City of Seven Ravines.

Archaeologists have actually learnt about the website considering that the early 2000s, when the United States Department of Defense declassified a set of pictures taken by its Corona spy satellite in 1972, when Kazakhstan belonged of the Soviet Union and the United States aspired to see what was occurring behind the Iron Curtain. Those images recorded the details of Semiyarka’s kilometer-long earthworks, however the current studies expose that the Bronze Age city was much bigger and far more intriguing than anybody understood.

This 1972 Corona image reveals the details of Semiyarka’s structures.

Radivojevic et al. 2025

When in doubt, it’s possibly significant

Many people on the sparsely inhabited steppe 3,500 years ago remained on the relocation, following trade paths or herds of animals and living in momentary camps or little seasonal towns. If you were a time-traveler trying to find ancient cities, the steppe simply isn’t where you ‘d go, which’s what makes Semiyarka so unexpected.

A couple of groups of individuals, like the Alekseeva-Sargary, were simply starting to accept the concept of long-term homes (and their signature design of pottery depends on pieces all over what’s left of Semiyarka). The biggest ancient settlements on the steppe covered around 30 hectares– no place near the scale of Semiyarka. And Radivojevic and her associates state that the design of the structures at Semiyarka “is uncommon … differing more standard settlement patterns observed in the area.”

What’s left of the city consists primarily of 2 rows of earthworks: kilometer-long rectangular shapes of earth, stacked a meter high. The geophysical study exposed that “significant walls, most likely of mud-brick, were constructed along the within edges of the earthworks, with internal departments likewise noticeable.” Simply put, the long mounds of earth were the structures of rows of structures with spaces. Based upon the artifacts discovered there, Radivojevic and her associates state the majority of those structures were most likely homes.

The 2 long earthworks fulfill at a corner, and simply behind that crossway sits a bigger mound, about two times the size of any of the private homes. Based upon the faint lines traced by aerial images and the geophysical study, it might have had a main yard or chamber. In real archaeologist style, Durham University archaeologist Dan Lawrence, a coauthor of the current paper, explains the structure as “possibly significant,” which suggests it might have been an area for routines or neighborhood events, or perhaps the home of an effective household.

The city’s design recommends “a degree of architectural preparation,” as Radivojevic and her associates put it in their current paper. The website likewise yielded proof of trading with nomadic cultures, in addition to bronze production on a commercial scale. Both are things that recommend preparation and company.

“Bronze Age neighborhoods here were establishing advanced, organized settlements comparable to those of their contemporaries in more typically ‘metropolitan’ parts of the ancient world,” stated Lawrence.

Who put the bronze in the Bronze Age? Semiyarka, obviously

Southeast of the mounds, the ground was spread with damaged crucibles, little bits of copper and tin ore, and slag (the things that’s left over when metal is drawn out from ore). That recommended that a great deal of smelting and bronze-casting taken place in this part of the city. Based upon the size of the city and the location obviously reserved for metalworking, Semiyarka boasted what Radivojevic and her associates call “a highly-organized, perhaps restricted or regulated, market of this desired alloy.”

Bronze belonged to daily life for individuals on the ancient steppes, comprising whatever from ax heads to precious jewelry. There’s a factor the duration from 2000 BCE to 500 BCE (mileage might differ depending on area) is called the Bronze Age. The historical record has actually used nearly no proof of where all those bronze doodads discovered on the Eurasian steppe were made or who was doing the work of mining, smelting, and casting. That makes Semiyarka an uncommon and essential glance into how the Bronze Age was, actually, made.

Radivojevic and her associates anticipated to discover traces of earthworks or the buried structures of mud-brick walls, comparable to the earthworks in the northwest, marking the website of a huge, central bronze-smithing workshop. The geophysical studies discovered no walls at all in the southeastern part of the city.

“This location exposed couple of functions,” they composed in their current paper (archaeologists describe structures and walls as functions), “recommending that metallurgical production might have been distributed or taken place in less architecturally formalized areas.” Simply put, the bronzesmiths of ancient Semiyarka appear to have actually operated in the outdoors, or in a scattering of smaller sized, less long-term structures that didn’t leave a trace behind. They all appear to have actually done their work in the very same location of the city.

Links in between wanderers and city-dwellers

East of the earthworks lies a broad location without any trace of walls or structures below the ground, however with a scattering of ancient artifacts lying half-buried in the turf. The long-forgotten items might mark the websites of “more ephemeral, possibly seasonal, profession,” Radivojevic and her associates recommended in their current paper.

That location comprises a big piece of the city’s approximated 140 hectares, raising concerns about the number of individuals lived here completely, the number of stopped here along trade paths or pastoral migrations, and what their relationship resembled.

A couple of damaged potsherds use proof that the settled city-dwellers of Semiyarka traded frequently with their more mobile next-door neighbors on the steppe.

Within the city, the majority of the ceramics match the design of the Alekseevka-Sargary individuals. A few of the potsherds uncovered in Semiyarka are plainly the workmanship of nomadic Cherkaskul potters, who lived on this very same broad sea of yard from around 1600 BCE to 1250 BCE. It makes good sense that they would have traded with individuals in the city.

Along the close-by Irtysh River, archaeologists have actually discovered faint traces of numerous little encampments, dating to around the very same time as Semiyarka’s prime time, and 2 burial mounds stand north of the city. Archaeologists will need to dig much deeper, actually and figuratively, to piece together how Semiyarka suited the ancient landscape.

The city has stories to inform, not practically itself however about the entire large, open steppe and its individuals.

Antiquity, 2025. DOI: 10.15184/ aqy.2025.10244 (About DOIs).

Kiona is a freelance science reporter and resident archaeology geek at Ars Technica.

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