New map reveals lost roads of the Roman Empire

A team of researchers has produced the first high-resolution digital map of the Roman Empire’s road network, revealing its true scale and distribution. Previous estimates suggested Roman roads spanned around 150,000 kilometers, but the new study indicates the network reached nearly 300,000 kilometers during the empire’s peak in the second century C.E. Despite centuries of research, only 2.7% of the roads’ precise locations are known, including well-preserved sections of the *Via Appia*. The map combines historical datasets, satellite imagery, and modern topographical data to reconstruct the empire’s road infrastructure. The findings challenge the notion that Rome invented road-building, as the Romans instead expanded and integrated pre-existing systems from regions like the Hellenistic kingdoms, Persia, Assyria, and Babylon. For example, the Royal Road between Susa and Sardis was already in use before Roman conquest. The road network was critical to the empire’s expansion, enabling troop movements, trade, and the transport of food across vast territories. It connected densely urbanized areas, facilitating the flow of people, goods, and ideas from Egypt to Germany and Spain to Turkey. The study highlights how Rome’s ability to scale existing infrastructure contributed to its dominance. Researchers acknowledge the humbling reality that despite extensive study, most Roman roads remain lost or unlocated. The *Via Appia*, often considered the archetype of Roman roads, represents only a small fraction of the empire’s extensive network. The new map provides a foundation for future archaeological and historical research to uncover the remaining roads and understand their full impact on Roman society.