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Digital map brings ancient Roman roads back to life

2025-11-27 08:22:00, Kosova & Bota CNA

For the first time, researchers have mapped the entire extensive Roman road network, highlighting its extraordinary influence on European relations and history.

"All roads lead to Rome!" Roads were the lifeblood of the Roman Empire, stretching from Britain to North Africa — along them people settled; armies marched; merchants, goods, knowledge, and power traveled — to the farthest reaches of the empire. Even today, the Roman road network continues to shape large parts of Europe, the Middle East, and North Africa.

Now, a major new digital research project is fundamentally changing the way we see this ancient infrastructure. The international academic team behind the Itiner-e project has created the first high-resolution, open-data set mapping the entire road network of the Roman Empire. In total, they have managed to digitally map 299,000 kilometers of roads spanning some 4 million square kilometers of the former empire, almost doubling the length of roads previously thought to exist.

Itinerary: Digital Mapping of the Ancient World

To digitize the network, reliable sources were studied. Researchers searched archaeological sites, travel diaries, and centuries-old maps such as the Tabula Peutingeriana. The historical tracks found were compared with modern aerial and satellite imagery to create Itineraries.

Traces of Roman land division (Centuriation), known not by walls or canals but by plots, as the Romans divided new and conquered lands equally into rectangular blocks — are still recognizable today as paths, roads or boundaries. They are clearly visible in aerial photographs, on cadastral maps and even during walks, especially in northern Italy, southern France and Tunisia.

The researchers ultimately merged 14,769 individual segments into a detailed geographic information system (GIS), accurate to 50 meters, that links each road section with regional metadata, quality indicators, resources, and digital links to information on ancient settlements. This provides, for the first time, a more comprehensive understanding of how people moved around, how empires were administered, and even how diseases spread.

Digital methods and archaeological detective work

In addition to over 100,000 km of main roads, researchers also mapped 195,000 km of secondary roads, visualizing mobility in the most remote areas of the empire.

Another innovation of the team was the use of digital models to simulate the speed, route, and physical obstacles of roads crossing difficult terrain.

Roads: Foundation of the Roman Empire's Power and Mobility

Another innovation of Itinerary is the clear presentation of how the Romans' logistical prowess enabled the massive expansion of the empire — enabling trade, intellectual exchange, and military control of vast territories. Over 100,000 km of main roads crisscrossed the empire, equipped with mileposts, military posts, and administrative centers, and therefore well documented.

The layout of secondary roads reflects the development of regional economies and daily movement. From the data, the researchers noted that some areas retain clear traces of the network even today, while others have been reconstructed through digital analysis based on the history and sources of the areas. The project thus opens up numerous possibilities for future research.

Mapping the Unknown: Why Roman Roads Still Remain a Mystery?

The Itiner-e road atlas also tells a story of uncertainty, as although most roads are documented in written sources, their exact route is often unknown. The reason is related to the different versions of the stories that have survived to this day, topographical changes, and the natural expansion of the road network over the centuries.

Researchers say that only 2.7% of the routes can be mapped with archaeological certainty. In nearly 90% of cases, researchers can only determine a "probable" route. While for the final 7.4%, scientists can only suggest "hypothetical" routes that the routes should have followed.

The dataset also includes "Credibility Maps," something completely new in archaeology, which highlight regions and segments that need excavation or better documentary sources.

Re-measuring Roman roads means rewriting European history

One thing the Itiner-e project makes clear: the paths of history are much longer and more complicated than previously thought.

With this project, researchers have uncovered major gaps, but at the same time they have also opened new avenues for fascinating stories and new discoveries. Every archaeological gap is an invitation to continue research./ DW