7Barry, T.B., S. Diarmond, T.D. Shanley, Maura Scannell, and Edelgard Soergel-Harbison. "Archæological Excavations at Dunbeg Promontory Fort, County Kerry, 1977." Proceedings of the Royal Irish Academy. Section C: Archaeology, Celtic Studies, History, Linguistics, Literature 81C (1981): 311-312. The clochán has an internal diameter of up to 7.5 m. (24.6 ft). The doorway, which faces north-west, has a height of 1.3 m ( (4.3 ft). In the eastern "guard room," the roof is about 2 m (6.5 ft) above floor level, which would allow a man to stand upright.. However the western chamber is only about 1.2 m (4 ft) high so a man of average height inside would need to crouch or lie prone. The Gallarus Oratory, near the town of Dingle, is an evolved example of the more primitive clochán in Dunbeg Fort and the other nearby clochain in the Fahan area. It can be explored in virtual reality here.