Perkūnkalnis, situated between the Kūna stream to the northwest and the Cirkliškis lake valley to the southwest, stands out for its geographical layout and historical significance. The slopes of this hill, reaching heights of 10-11 meters, create a dramatic and impressive landscape. The oval platform at the top of the hill, measuring 30 x 20 meters, is rounded by embankments, varying in height from 0.6 to 1.2 meters, forming a defensive structure that accentuates the hill's perimeter.
Special attention is given to the fortifications on the southeastern and northeastern slopes, which reach up to one meter in height, and the western slope, which has two levels of embankments
at heights of 2 and 1 meters. These fortifications not only emphasize the importance and defensive potential of the hill but also testify to the efforts of past inhabitants to protect their territory.
At the southwestern foot of the hill, remnants of an ancient settlement and artifacts such as iron slag add to the historical narrative of the hill, providing valuable insights into the daily life and activities of the past civilizations in this area.
Perkūnkalnis becomes not only an object of archaeological research but also a part of the cultural and natural heritage, attracting history enthusiasts and nature lovers to explore and experience this unique site.