Glava Panega karst spring at the village of Zlatna Panega, Lovech district. The water spouts from a siphon cave whose opening is 7 meter under the level of a deep lake, called Gornoto (the Upper Lake). The size and depth of the siphon have not been measured yet. Divers have penetrated as deep as 31 m under the lake surface but could not trace the faces of the siphon. Gornoto (the Upper) and Dolnoto (the Lower) lake that communicate via a subterranean siphon as long as 100 m get their water from there. The river Panega takes its source from Lake Dolnoto. Remains of a Thracian settlement and of a shrine have been discovered around the spring. Listed as a natural sight in 1966.