¹ The development regions of Romania have no administrative role and were formed in order to manage funds from the European Union.
² as of 2007, the Prefect is not a politician, but a public functionary. He (or she) is not allowed to be a member of a political party, and is banned from having any political activity in the first six months after his resignation (or exclusion) from the public functionaries' corps.
³w, x, y, and z are digits that indicate the city, the street, part of the street, or eaven the building of the address
⁴x is a digit indicating the operator: 2 for the former national operator, Romtelecom, and 3 for the other ground telephone networks
⁵used on both the plates of the vehicles that operate only in the county limits (like utilitary vehicles and ATVs, etc.), and the ones used outside the county

Arad (Romanian pronunciation: [aˈrad]) is an administrative division (judeţ) 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.

In Hungarian, it is known as Arad megye, in Serbian as Арад / Arad, and in German as Kreis Arad. The county was named after its administrative center, Arad.

The county has a total area of 7,754 km², representing 3.6% of national Romanian territory. The terrain of Arad County is divided into two distinct units that cover almost half of the county each. The eastern side of the county has a hilly to low mountainous terrain (Dealurile Lipovei, Munții Zărandului, Munții Codru Moma) and on the western side it's a plain zone consisting of the Arad Plain, Low Mures Plain, and The High Vinga Plain. Taking altitude into account we notice that it follows a stepped pattern as it drops as we go from the east to the west of the county from 1489 m to below 100 m. In the east there are the Zarand Mountainsnand the Codru Moma Mountains, all subdivisions of the Apuseni Mountains, a major group of the Western Carpathians.

In terms of climate, the characteristics of Arad county have a typical temperate continental climate with oceanic influences, with a circulation of air masses with a predominantly western ordered direction visible from west to east, with increasing altitude. Average annual temperatures range from 10 °C in the lowlands, the hills and piedmonts 9 °C, 8 °C and 6 °C in the low mountains in the area of greatest height. Average amounts of precipitation fall in values between 565–600 mm annually in the lowlands, 700–800 mm annually in the hills and piedmonts and 800–1200 mm annually in the mountainous area.

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Wikipedia