The Krupaj spring is located in eastern #Serbia, at the western side of Mount )Beljanica.
It once emerged from a cave with a great force, accompanied by a roaring sound, but today it is walled over with a concrete water gate, for use by the wool-carding and flour mill that is still in operation today.
As a result, the cave mouth has been partially submerged by the pond which has formed. Near to the emergence there is a powerful thermal spring, with a water temperature of 26.50C. The Krupaj Spring is protected as natural monument of national importance.
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