The 14th-century hillfort complex of Maštaičiai-Narkūnai

Located 4 kilometers west of Gelgaudiškis near the village of Maštaičiai in the Kiduliai eldership, the Maštaičiai-Narkūnų hillfort is a significant archaeological site. The hillfort sits on a high bank of the left bank of the Nemunas, forming part of a complex that includes a hillfort, three successive hillforts (papilai), and an ancient harbor site in the Nemunas valley. The hillfort itself is shaped like a wedge, situated behind a 30-meter wide and 5-meter deep trench, and stands 3 meters higher than the first hillfort (papilys).

At the northern end of the hill is a trapezoidal courtyard measuring 50 meters long, with a width of 45 meters in the southwest and 25 meters in the northwest. This courtyard covers an area of 2,500 square meters. In the southwest of the courtyard, there is a 0.8-meter high, 10-meter wide embankment, with a 2-meter wide terrace situated 2 meters below it on the southwest slope. From this terrace, a 26-meter wide and 7-meter deep trench is excavated towards the southeast, which is divided by a 5-meter wide, 1-meter high rise in the southeast section.

Other features include a 3-meter wide, 0.5-meter deep trench and a 4-meter wide, 0.5-meter high embankment on the northern slope, located 5 meters below the courtyard level. On the southeast slope, a 6-meter wide terrace is situated 4 meters below the courtyard. Near the eastern edge of the courtyard, there is a 1-meter deep pit containing mixed earth. Pieces of burnt clay were found at the southern end of the courtyard, while the steep slopes of the hillfort rise more than 40 meters from the Nemunas side.

Sources: Wikipedia, OpenStreetMap, Wikidata, Wikimedia Commons