These groups are the Leitha mountains, the Styrian highlands, the Lower Hungarian highlands, which are a continuation of the former, and the Bakony Forest.
The Sla y s, the most numerous race after the Magyars, are divided into several groups: the Slovaks, mainly massed in the mountainous districts of northern Hungary; the Ruthenians, established mainly on the slopes of the Carpathians between Poprad and Maramaros Sziget; the Serbs, settled in the south of Hungary from the bend of the Danube eastwards across the Theiss into the Banat; the Croats, overwhelmingly preponderant in Croatia-Slavonia, with outlying settlements in the counties of Zala, Vas and Sopron along the Croatian and Styrian frontier.
In the single internment camp of Arad there were 3,400 deaths among the victims from Bosnia alone; and Father Nikolic, a Catholic priest from Istria, testified to having himself buried over 2,000 Istrian victims, and Doctor Martinovic to a knowledge of 8,000 fatal cases in the Styrian camps.
The southern flank is formed by the massif of the Reichensteiner Gebirge, which culminates in the Hochthor (77 80 ft.) and belongs to the north Styrian Alps, also called Eisenerzer Alps.
Other groups of the north Styrian Alps are the Hochschwab, with the highest peak the Hochschwab (7482 ft.) and the Hochveitsch with the Hohe Veitsch (6501 ft.).