The hillfort is located in Paparčiai Eldership, Paparčiai village, 0.85 km east-southeast of the Žasliai–Vievis road intersection to Pakalniškės, 0.4 km southeast of the Žiežmara River culvert on the Žasliai–Vievis road, on the right banks of the Žiežmara and Kotupis rivers, northeast of their confluence.
The hillfort is situated on a corner of the highland in the Žiežmara and Kotupis valley, on its eastern promontory. It is bordered by Kotupis to the south, Žiežmara to the west and northwest, and the Žiežmara valley to the north, while it borders the highland to the south and southwest.
The slopes are steep, 27–28 meters high (northwest, north, and east). The steepest slopes are the southern, western, and
northwestern ones. The hill is approximately 0.9 km long in the west-east direction and 0.4 km wide. The top is flat, merging with the highland further south and southwest.
The hill is called Castle Hill.
It is said that a wooden castle once stood on this hill, inhabited by a duke. During battles with the Crusaders, the castle was burned down. It is also said that priestesses (vaidilutės) kept a fire burning on this hillfort.
People mentioned that old swords, bayonets with rusted tips were found on the hill. Although a local resident claimed that the hill had been plowed for a long time, no significant finds were discovered, only some brick fragments were occasionally found on the western slope where a building once stood.