The complex consists of five distinct hillforts: Sudargas, Žydkapiai, Balnakalnis, Bevardis, and Pilėkalnis.
The site is frequently cited by historians as a primary candidate for the legendary castle of Pilėnai, where the defenders chose mass suicide over capture by the Teutonic Order in 1336.
The mounds are situated directly on the border between Lithuania and the Kaliningrad Oblast of the Russian Federation.
The Nemunas River here forms a natural geopolitical border, making these mounds the westernmost defensive ramparts of historical Lithuania.
Despite its proximity to the border, the site is fully accessible to the public and contains no restricted military zones.
The defensive potential of these mounds was enhanced by the naturally steep slopes of the river valley, which reach heights of up to 30 meters.
Sudargas mounds comprise a complex of five interconnected defensive hillforts located on the high left bank of the Nemunas River in the Šakiai district. These earthworks served as a critical defensive line for the Grand Duchy of Lithuania against the Teutonic Order during the 13th and 14th centuries. The site, historically known as Pilėnai in some academic interpretations, features deep ravines separating the individual mounds. Archaeological excavations have revealed remnants of ancient fortifications and cultural layers dating back to the late Iron Age. A wooden staircase network provides access between the mounds and the riverbank promenade. The area is maintained as a protected archaeological heritage site with wooden viewing platforms and commemorative monuments. Visitors can traverse the entire ridge which offers a direct visual line of sight to the Kaliningrad Oblast side of the Nemunas river.
The highest observation platform on the main Sudargas mound overlooking the Nemunas river bend.
Wear sturdy hiking boots, as the wooden stairs and dirt paths become slippery after rain.
Bring binoculars to get a clearer view of the Russian side of the river and local birdlife.
The site is exposed to strong winds due to its position on the riverbank; dress in layers regardless of the season.
Attempting to descend the steep, non-stabilized slopes outside of the designated staircases.
Stay on marked trails to prevent soil erosion; do not disturb the archaeological mounds.
