The depth of the wolf pit is 8–10 m, length—75 m, width—40 m, area—0.21 ha. It is a slightly elongated pit shaped as a funnel, facing west-east direction. At its bottom and around it lurks yellow sand of various grains with a rare admixture of gravel. There are old excavation marks at the bottom of the pit. The pit is dry. Based on the available geological material and the general analysis of the geological situation, it can be assumed that it is a glaciokarst pit. In other words, the surface "cracked" after a piece of buried ice melted under the sand. This pit is dry because the surface water in the sandy sediments reaches much deeper than the bottom of the pit. According to the story of L. Medekša (born in 1926), a resident of Grabijolai village, "There is a big deep pit behind the river. Dad said my great-grandfather was digging there and even dug up big red bricks. They made a tunnel starting at Kernavė and ending in Vilnius. And when that tunnel collapsed, the pit appeared.