Danube–Criș–Mureș–Tisa Euroregion in the context of Hunedoara County

Timiș (Romanian pronunciation: [ˈtimiʃ]) is a county (județ) of western Romania on the border with Hungary and Serbia, in the historical region of Banat, with the county seat at Timișoara. It is the westernmost and the largest county in Romania in terms of land area. The county is also part of the Danube–Criș–Mureș–Tisa Euroregion.

Arad County (Romanian pronunciation: [aˈrad] ) is an administrative division (județ) of Romania roughly translated into county in the western part of the country on the border with Hungary, mostly in the region of Crișana and few villages in Banat. The administrative center of the county lies in the city of Arad. The Arad County is part of the Danube–Criș–Mureș–Tisa Euroregion.

Caraș-Severin (Romanian pronunciation: [ˈkaraʃ seveˈrin] ) is a county (județ) of Romania on the border with Serbia. The majority of its territory lies within the historical region of Banat, with a few northeastern villages considered part of Transylvania. The county seat is Reșița. The Caraș-Severin county is part of the Danube–Criș–Mureș–Tisa Euroregion.

Csongrád-Csanád (Hungarian: Csongrád-Csanád vármegye [ˈt͡ʃoŋɡraːd ˈt͡ʃɒnaːd]) is an administrative county (comitatus or vármegye) in southern Hungary, straddling the river Tisza, on the border with Serbia and Romania. It shares borders with the Hungarian counties Bács-Kiskun County, Jász-Nagykun-Szolnok County and Békés. The administrative centre of Csongrád-Csanád county is Szeged. The county is also part of the Danube–Criș–Mureș–Tisa Euroregion.

Jász–Nagykun–Szolnok (Hungarian: Jász-Nagykun-Szolnok vármegye, pronounced [ˈjaːs ˈnɒckun ˈsolnok]) is an administrative county (comitatus or vármegye) in Hungary. It lies in central Hungary and shares borders with the Hungarian counties Pest, Heves, Borsod–Abaúj–Zemplén, Hajdú–Bihar, Békés, Csongrád, and Bács–Kiskun. The rivers Tisza and Körös flow through the county. The capital of Jász–Nagykun–Szolnok county is Szolnok. Its area is 5582 km. The county is named after the Ossetians (Jasz) and Cumans (Kun) who settled there, along with Szolnok. The county was part of the Danube–Criș–Mureș–Tisa Euroregion between 1997 and 2004.