text: Hajdú–Bihar (, ) is an administrative county (comitatus or vármegye) in eastern Hungary, on the border with Romania. It shares borders with the Hungarian counties Szabolcs-Szatmár-Bereg, Borsod–Abaúj–Zemplén, Jász–Nagykun–Szolnok and Békés. The capital of Hajdú-Bihar county is Debrecen. Together with Bihor County in Romania it constitutes the Biharia Euroregion.