Kétbejáratú Cave

The Kétbejáratú Cave is one of the caves located in the Pilis Mountains within the Danube–Ipoly National Park, situated in Oszoly. It is also described in tourist guidebooks.

Description

The cave opens on the side of the fourth rock cliff that faces the settlement, located in the outskirts of Csobánka, east of the Oszoly Óra-falát. It is situated 120 m east of the Rózsalugas passage, 20 m higher. The entrance on the D side is 1.4 m wide, 1.6 m high, wide, oval, and slanted. The entrance on the E side is 0.8 m wide, 0.4 m high and flat.

The gently sloping passage cave formed in Upper Triassic Dachstein limestone under phreatic conditions. By comfortably walking through the D‑side entrance one reaches a gradually flattening chamber from which narrow fissures begin. About 3 m after the entrance, to the left, the light entering through the other entrance of the cave is already visible. From here, by climbing a small ledge and mostly crawling over stone debris, one can exit the cave through the E‑side entrance. The characteristic cave remains with beautiful forms are accessible without any equipment.

In 1974 the cave was first called Kétbejáratú Cave in its literature. In the literature the cave also appears under the names Kétbejáratú barlang (Bertalan 1976) and Kétszájú‑barlang (Kordos 1981).

Research History

In the 1967 book Pilis útikalauz it was reported that on the north side facing Oszoly Csobánka, among the forest‑surrounded limestone rocks, there are several insignificant cavities. According to a publication in the 1969 Karst and Cave Research Bulletin, in August 1969 the Speleology Cave Research Group placed fixed points in the eight smaller and larger cavities on the Oszoly and Oszoly‑side during a camp organized in Kevélyek. In 1970 László Kordos examined the cave air with an Assmann aspirational psychrometer. In 1970 László Kordos surveyed the cave with lost points and a mining compass. Based on the survey a 1:100 scale floor‑plan map with two cross‑sections was drawn. According to the survey the cave is 11 m long and 3 m deep.

The 1970 report of the Speleology Cave Exploration Group states that the Kétbejáratu cave is located on the side facing the Csobánka access road of the fourth rock group extending from the Oszoly Óra-fal to É, at the foot of the rock group. The cave (as its name also indicates) has two entrances. One entrance is 2.2 m high, then after about 4 m it narrows and ends in a small chamber. From the former chamber a narrow, flat, tube‑shaped passage leads to the other entrance. The cave was probably formed by water flow in the upper Triassic white Dachstein limestone fractured rock. It contains little debris fill and encrusted dripstones. The cave does not appear in the literature. Earlier researchers are unknown. In 1970 the Speleology Cave Exploration Group examined it. The cave can be viewed without equipment. The report’s appendix includes the map made in 1970.

In the book Pilis útikalauz published in 1974, in the list of caves of the Pilis Mountains and the Visegrád Mountains (pages 19–20), it is mentioned that among the caves of the Pilis and Visegrád Mountains are the Oszoly caves and the Kétbejáratú cave. According to the section describing the caves of the Pilis Mountains, there are about a dozen small caves among the Oszoly rocks rising above Csobánka. These were mapped and regularly explored by the Speleology Cave Exploration Group. Most of these small caves are not very spectacular, but they should be mentioned because some of them provide excellent bivouac possibilities in the Oszoly rock walls regularly visited by tourists, especially rock climbers, and in their vicinity. The 11 m long Kétbejáratú cave opens at the foot of the side of the fourth rock group rising from Óra-fal to É, facing the Csobánka access road, and its narrow passage leads to a small chamber.

In the 1975 MKBT Report the 1970 report's section concerning the cave was published together with the map attached to the report. The publication contains a site drawing on which the geographic locations of the Csúcs Hill and the Oszoly caves can be seen. The drawing shows the geographic location of the Kétbejáratu cave. In the manuscript written by Bertalan Károly and completed in 1976 it can be read that the Kétbejáratú cave is located in the Kevély group in the Pilis Mountains, at Pomáz. The cave is situated on the side of the fourth rock group extending from the Oszoly Óra wall to the east, on the side facing the Csobánka access road, and it has two entrances. One entrance is 2.2 m high. The cave is 11 m long and 3 m deep. It is a cavity ending in a small chamber, from which a flat, tube‑shaped passage leads to the second exit. The part of the manuscript describing the cave was written based on two literary works.

In the 1981 first‑semester issue of Karst and Cave it was made public that the Kétszájú cave has the cave‑registry number 4820/29. In the 1984 book *Caves of Hungary* the national cave list includes the cave among the Pilis Mountains caves under the name Kétszájú‑cave with the variant name Kétbejáratú‑cave. Associated with the list, the geographic location of the cave is shown on a 1 : 500 000 scale map presenting the geographic locations of the Dunazug Mountains caves. The 1991 guidebook repeats the cave description from the 1974 guidebook and the general description of the Oszoly caves. In the 1991 compilation written by József Kárpát it is mentioned that the Kétbejáratú‑cave (Csobánka) is 11 m long and 2 m deep.