Berettyóújfalu is a town in Hajdú-Bihar county, in center of the Northern Great Plain region of eastern Hungary, near the border with Romania. It is strategically located, being 35 km south of Debrecen, the second largest city in Hungary, and 40 km west of Oradea, the tenth largest city in Romania. Berettyóújfalu is named after the river Berettyó.

Hajdú–Bihar is an administrative county 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.