The river Vratna is a river in eastern Serbia with the village of the same name, not far from Brze Palanka and the right is a tributary of the Danube. The most famous is the three highest natural stone bridge in Europe. overflows that resemble a door, and the river was named after it. It springs on the Great Reef and has a flow of 26 km [2], and during the summer part of the year, there is no constant flow, but in several places it sinks and re-emerges to the surface. At the end of her canyon in the upper part of the stream, there is a monastery of the same name which dates from the XIV century, as well as a hunting ground with mouflon and deer paddles.
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