In the Western peninsula of Lesvos, between the settlements of Pterountas and Chidira, is the small but impressive waterfall Vathylimnos.
Its waters originate from the mountainous massif of Prophet Ilias (799m.), on the slopes of which grows the only black pine forest on the island. Among the dense black pine forest, the unique in Greece, but also in Europe, riverside plant communities with rhododendron (Rhododendron Luteum) thrive, as well as peonies (Paeonia mascula) (Peonia the Romalea) and the large fern called “Osmunda the basilisk” (Osmunda regalis).
The waterfall is created across the discontinuities of the faults, which run through the wider area, where they affect the smooth flow of the stream. The stream continues its flow towards the lower altitudes, where it feeds the Voulgaris River, which empties into the northwest coast of Lesvos.