In the 1970s, excavations were carried out by Mária Károlyi at the Celtic settlement, which had entered the literature as the Fortress of Ostffyasszonyfa. The site is located in the floodplain of the Rába River, on the banks of the Lánka stream, on the top of a hill today largely covered by forest. The approximately 25-hectare site was protected by several ditches made of stone and earth with wooden structure. The main earthwork in the 1970s was 12-13 m wide and 2.5 m high. This included a ditch 8-10 m wide and 2.5-4 m deep. Terraces were created in the area when the settlement was established. The oppidum had two entrances with wooden gates and protected by watchtowers on both sides.