The Matra group, e.g., is poorly supplied, while the outliers of the Vertes mountains towards the Danube are almost entirely wanting in streams, and have but few water sources.
Of a similar character was the Correspondance litteraire secrete (1774-1793), to which Matra was the chief contributor.
The smaller groups of the Hungarian highland are: on the south-west the Neograd Mountains (2850), whose offshoots reach the Danube; to the east of them extends the Matra group, with the highest peak the Sasko (3285 ft.).
It lies on the south-western outskirts of the Matra mountains, and carries on a brisk trade in the Erlauer wine, which is produced throughout the district.
It is beautifully situated in the valley of the river Eger, an affluent of the Theiss, and on the eastern outskirts of the Matra mountains.
The Matra group is of volcanic origin, rising abruptly in the great Hungarian plain, and constitutes one of the most beautiful groups of the Carpathians; lastly, to its east extend the thicklywooded Biikk Mountains (3100 ft.).