At the entrance of Nestorio. According to myth, its color came from the blood of the winged horse that fell there, blinded by Jupiter. Another tradition claims that the cave at its base was once the nest of a huge snake that protected the area.
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https://www.digitalkastoria.gr/en/culture-tourism-events-en/nature-excursions-en/o-kokkinos-vraxos-nestoriou-en#sigProId6b0e4bd2e2