The county shared borders with the Austrian land of Lower Austria and the Hungarian counties Nyitra, Komárom, Győr and Moson. It was situated between the river Morava in the west, the river Danube in the south, and the river Váh () in the east. The southern part of the Little Carpathians divided the county into two. It also covered most of the island known today as Žitný ostrov (Hungarian: Csallóköz) between the Danube and the Little Danube. Its area was 4,370 km² around 1910.