The Antončikas spring leaks down the slope of the Skroblus Valley, at the bottom of the fossil circus. Groundwater flows to the surface in two spots that are side by side. The stream of water rising upwards is constantly laying sand. The depth of the spring is over 1.5 m. The spring still flows 250 m from the origins to the Skroblus River, collecting water from smaller springs on the slopes along the way.