Nógrád (county) in the context of Northern Hungary

Heves county (Hungarian: Heves vármegye, pronounced [ˈhɛvɛʃ]) lies in northern Hungary, between the right bank of the river Tisza and the Mátra and Bükk mountains. It shares borders with the Hungarian counties Pest, Nógrád, Borsod-Abaúj-Zemplén and Jász-Nagykun-Szolnok. Eger is the county seat.

Borsod–Abaúj–Zemplén (Hungarian: Borsod-Abaúj-Zemplén vármegye, pronounced [ˈborʃod ˈɒbɒuːj ˈzɛmpleːn]; Slovak: Boršodsko-abovsko-zemplínska) is an administrative county (comitatus or vármegye) in north-eastern Hungary (commonly called "Northern Hungary"), on the border with Slovakia (Košice Region). It shares borders with the Hungarian counties Nógrád, Heves, Hajdú–Bihar and Szabolcs–Szatmár–Bereg. The capital of Borsod–Abaúj–Zemplén county is Miskolc. Of the seven statistical regions of Hungary it belongs to the region Northern Hungary.

Borsod-Abaúj-Zemplén is the second largest county of Hungary both by area (after Bács–Kiskun) and by population (after Pest County). It is the only Hungarian county with two UNESCO World Heritage Sites (the Caves of Aggtelek Karst and Slovak Karst and the Tokaj Wine Region Historic Cultural Landscape).

Cserhát ([ˈtʃɛrhaːt]) is a mountain range in Hungary, part of the North Hungarian Mountains. It is divided between Pest and Nógrád counties. Its highest point is the Karancs with an elevation of 729 metres above sea level.

Cserhát stretches from Cserhátalja to the valley of the Ipoly (Slovak: Ipeľ) river. Its central part is mountainous, covered with forests, while its southern and northern parts are hilly.

The Ipeľ (Slovak; pronounced [ˈipeʎ]) or Ipoly (Hungarian) (German: Eipel, archaic Slovak: Jupoľ, Latin: Bolia) is a 232-kilometre (144 mi) long river in Slovakia and Hungary, a tributary of the Danube River. Its source is in central Slovakia in the Slovak Ore Mountains. It flows south to the Hungarian border, and then southwest, west, and again south along the border until it flows into the Danube near Szob.

The Ipeľ flows through or creates the border of the Banská Bystrica and Nitra regions in Slovakia, and Nógrád and Pest counties in Hungary.