Carsium was a fort in the Roman province of Moesia in the 1st century AD[3][4] whose remains are still visible.

It was part of the defensive frontier system of the Limes Moesiae along the Danube.

It was initially in Moesia and later in Scythia Minor province.

It also had a naval port for a detachment of the Classis Moesica.

A well-preserved parade helmet of the 2nd century AD was found here, now in the National Museum in Bucharest.