In the eastern part of Matese there are 11 caves, that can be subdivided into three morphological groups:
• Absorption pits
• Geysers
• Abyss
The first group includes absorption caves or cracks enlarged after corrosions and collapses, vertically developed and about ten metres deep. Such pits have a small access and end with landslides or inaccessible bottle necks. Their location, at the bottom of a doline or in the bed of a stream, is apparently random; indeed, they develop along the track of Cul Di Bove cave with which it is most likely to exist a connection, still undiscovered.
The second group includes the geysers Ianara and Capo Quirino which consist of Karstic channels on E-W oriented fractures. Thye are active only after abundant rainfalls. Such geysers rise inside streams and develop along them. For example, the geyser Ianara goes up the stream to the connection with Cul Di Bove cave, whereas the geyser Capo Quirino rise to the base of a pit obstructed by soil and roots.
The third group includes the abyss Pozzo della Neve and Cul Di Bove, characterised by a horizontal development in the first part, with long galleries 250 m deep, and a vertical development in the second part, with deep pits rapidly succeeding and reaching a depth of 1000 m. The abyss Pozzo della Neve is more complicated having some ramifications, whereas Cul di Bove almost develop along the same branch oriented along E-W directrix