The Boulders of Stakai are conglomerates of sand and gravel. The geological object consists of 2 boulders lying next to each other on the top of a hill overgrown with trees. Dimensions of the boulders: larger crescent-shaped boulder's length is about 17 m, width up to 3 m, height about 1.5 m, smaller rectangular 6 m x 5 m, height up to 0.7 m. The object consists of the output of a naturally cemented conglomerate, which opens with a fragment of the geological layer, located at the elevation of the relief. There are 2 parts to this collection. The solid bar at the top of the elevation is horizontal and has a plate shape with a visible surface length of 6 m, a width of 5 m and a height of 0.7 m. Below the slope is the second part of the cluster, divided into three parts, with a total length of about 17 m, width - 3 m, height - about 1.5 m. There are not many similar objects in the diversity of Lithuanian geological heritage.