Hungarian Highlands also known as Südwestliches ungarisches Mittelgebirge (Southwest Hungarian low mountain range) is in present-day Hungary and includes Veszprém County.  Borders north to the Danube river, east at the turn of the Danube river near Budapest, south at Lake Balaton and west at the Raab (Raba) river.  Settlement centers were Buchenwald (Bakony Mts.), Schildgebirge, Ofner Bergland with Budapest.

Map showing the Bakony Mountains within the Hungarian Middle Mountains.
click image to enlarge, then click again.

Offener Bergland refers to the major Swabian villages that form a ring around Budapest, hence its name.  Offen is the German name for Buda which is a Bulgarian word for oven and guess what Offen means in German?  The Buchenwald is the German word to describe the Bakony Forest region which is a large sprawling region north of Lake Balaton including several counties.