Spring nearby the village of Karlukovo, called after the name of the gorge from where it rises. The gorge was denominated after the clan Penkovtsi, who had properties in this area. It is 3 km to the south of the village. In the past it was open but after the First World War it was dammed and the water diverted to 20 m away where a well was built. Its waters flow into the stream coming along Gergovskata Stubla, then Stubleshki Dol and disappears in the whirlpools. Its water is drinkable, used by the local people. 
Penkovskata Stubla

Natural sights
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