Topalu is a commune located on the right bank of the Danube in Constanța County, Northern Dobruja, Romania.

[4] Capidava is depicted in the form Calidava/Calidaua in Segmentum VIII of Tabula Peutingeriana (1st-4th century AD) on a Roman road between Axiopolis and Carsium.

[5][6] The map provides accurate data on the distances between Axiopolis, Capidava and Carsium.

This is also verified by the discovery of military marking pillar at Seimenii Mici that indicates the distance of 18,000 feet (27 km) from Axiopolis to Capidava.

Capidava is a Getic toponym, meaning the "curve fortified settlement".