Strázsa-hegyi Róka Cave

The 1926–1927 speleological survey mentions that during bat observations carried out in 1923–1924 in the Strázsahegyi fox hole (Esztergom county) András Tasnádi Kubacska and Lajos Véghelyi observed a few small long-eared bats (Rhinolophus hipposideros Bechst.) several times. On 24 July 1924 highly developed juveniles were still hanging on the mother animals.

The 1935 Forestry Gazette states that in the karstified rock group of Strázsa Hill, located near Esztergom and rich in very interesting rock formations, Lajos Véghelyi discovered three cavities. He named one of them the Strázsahegyi fox hole. The Tourist Magazine 1937 edition reads that the Strázsahegyi fox hole lies slightly above the Strázsa-hegyi-barlang and the Strázsa-hegyi-sziklaodút, to the north. After a few meters it gradually narrows; the hole is about 1 m wide and 0.5 m high. In Ottó Kadić’s manuscript completed in 1952 it is mentioned that the Strázsahegyi fox hole is located slightly above the Strázsa-hegyi-barlang and the Strázsa-hegyi-sziklaodút, to the north. Its 1 m wide and 0.5 m high entrance leads to a cavity several meters long that narrows toward the back. The part of the manuscript describing the cave was written based on the publication by László Schőnviszky.

According to the study published by Sándor Láng in 1953, there are three long‑known caves on Nagy‑Strázsa Hill (Strázsa‑hegyi‑barlang, Strázsa‑hegyi‑sziklaodú, Strázsahegyi rókalyuk) and one recently discovered cave (Sátorkőpusztai‑barlang). Of the three caves described earlier, the largest is the Strázsa‑hegyi‑barlang. The Strázsahegyi rókalyuk is located on the upper part of the hill. This cave is 15 m from the Strázsa‑hegyi‑barlang. The entrance of the cave facing EN faces at an altitude of 295 m a.s.l. This cave was also dissolved by karst water (as was the Strázsa‑hegyi‑barlang and the Strázsa‑hegyi‑sziklaodú), therefore it is a spring cave. Already Lajos Véghelyi thought that the three upper caves of the hill (Strázsa‑hegyi‑barlang, Strázsa‑hegyi‑sziklaodú, Strázsahegyi rókalyuk) were formed along a common fissure system. Sándor Láng assumed that the upper three caves are connected with the lower Sátorkőpusztai‑barlang and that each was dissolved by karst water enriched with calcite.

The manuscript completed in 1976 and written by Károly Bertalan mentions that the Strázsahegyi rókalyuk is located in the Pilis Mountains (Pilis range), Esztergom. About 20 m north of the Strázsa‑hegyi‑barlang, at an altitude of 295 m a.s.l., the entrance of the rókalyuk faces east‑north. The Strázsa‑hegyi Rókalyuk is 3–4 m long, 1 m wide and 0.5 m high and is a spring cave. The part of the manuscript describing the cave was written based on two publications. In the national cave list of the book *Magyarország barlangjai* published in 1984, the cave appears among the Pilis Mountains caves under the name Strázsa‑hegyi‑rókalyuk. Associated with the list is a 1:500 000 scale map showing the geographical location of the caves of the Dunazug Mountains, indicating the cave’s geographical position.

On May 29, 1997, József Regős surveyed the cave, and then on June 1, 1997, based on the survey, Sándor Kraus prepared the cave plan map and cross‑section map. The two maps present the cave at a scale of 1:50. The plan map shows the location of the cross‑section within the cave. On May 29, 1997, Sándor Kraus drew a site plan depicting the geographic locations of the caves of Kis‑Strázsa‑hegy, Középső‑Strázsa‑hegy and Nagy‑Strázsa‑hegy. The plan shows the geographic location of the Strázsa‑hegyi Rókalyuk marked as Rókaluk. In Sándor Kraus’s 1997 report it is stated that the Strázsa‑hegyi‑rókaluk, known before 1997, had its map produced in 1997. The report includes the site plan drawn in 1997.