Timiș 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 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.