Akmenyte source is a special appearance of their history. 1951-1952 m. Kupiškio city depths were investigated deep wells that reached the upper Devonian rock formations of the Holy. This resource trickles of 88,31 m deep, then drilled a borehole mouth. Before that came from the source of about 3 m long and 1.5 m wide waterhole, interference with the Lėvens bank of the river, and just a few meters long stream integrated in the flow of the river. Source water temperature of 7 ° C and a flow rate of 4 l / s. The hydrogeological natural heritage reflects Kupiskis edge of natural diversity.