Ung county shared borders with the Austrian crownland Galicia (now in Poland and Ukraine) and the Hungarian counties Bereg, Szabolcs and Zemplén. It was situated between the Carpathian Mountains in the north, the rivers Tisza and Latorca (present-day Latorica) in the south, and the river Laborc (present-day Laborec) in the west. The rivers Latorca and Ung (present-day Uzh) flowed through the county. Its area was 3230 km² around 1910.