Zemplén was an administrative county (comitatus) of the Kingdom of Hungary. The northern part of its territory is now situated in eastern Slovakia, while a smaller southern portion of the former county belongs to Hungary, as part of Borsod-Abaúj-Zemplén County.

Borsod–Abaúj–Zemplén is an administrative county in north-eastern Hungary, on the border with Slovakia. It shares borders with the Hungarian counties Nógrád, Heves, Hajdú–Bihar and Szabolcs–Szatmár–Bereg. The capital of Borsod–Abaúj–Zemplén county is Miskolc. Of the seven statistical regions of Hungary it belongs to the region Northern Hungary.