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The Pilis Mountains form a region 220 km² in the Trans-DanubienMountains between the towns of Budapest and Esztergom. They consists ofnarrow step, faulty, horsts, which are composed of Triassic limestonesand dolomites. In these rocks over 100, mainly thermal, karst cave havedeveloped.

In the southern region, the limestone and the dolomite is overlainby Eocene marl and Oligocene sandstone. In the sandstone extensive quarring operations have taken place. During the quarrying several sandstone caveswere found. The quarrying took place in the regions of Pilisborosjen ő and Budakalász. The exact number of caves is not known because many of them were immediately destroyed during the quarrying.

Recently, 6 non-karstic caves havebeen found near the above mentioned locations. The lower levels of thelarger caves have developed by karstification of the underlaying dolomite and limestone, but their upper levels are considered as non-karstic, due to the break up of the sandstone. Probably the smaller caves developedsimilarly but their lower levels have not been discovered.

The most important non-karstic cavesin the Pilis Mountais:

The length of the 6 non-karstic cavestotals 585 m.