Hârşova (also spelled Hîrşova) is a town located on the right bank of the Danube, in Constanţa County, Romania, with a population of 11,000.
In ancient times, it was a Roman town named Carsium, in the Scythia Minor province. The current name has a Slavic suffix "-ova" and it is still under debate wherever it is in any way linked with the ancient name. An alternative theory suggests that the town's name is of Turkish origins ("hırsız" means "thief" in Turkish).
The village Vadu Oii belongs to the township Hârşova. The village is linked with the Giurgeni commune over the Danube via the Giurgeni-Vadu Oii Bridge.