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The Myślibórz Gorge is the longest, deepest and best known among gorges in the eastern part of the Kaczawskie Foothills (Polish “wąwóz” translates as a “gully” which is an incorrect description). It is located to the west of the village of Myślibórz and is about 3.5 km long. Its depth increases downstream, from 30 m in the upper part to 80 m in the lower part. The gorge is drained by the Jawornik stream. The valley is incised into greenschist bedrock all along its length. Greenschists, in turn, are former submarine basaltic lavas, altered during later mountain building periods. Original pillow lava structures can be seen at several places within rock outcrops just above the channel and on crags emerging from the slopes. The gorge is within the “Chełmy” Landscape Park and its middle sector was declared a nature reserve in 1962, to cover an area of 9.72 ha. A rare hart’s-tongue fern occurs in a large population and forest communities show considerable diversity. They include maple-lime ravine forests, thermophilic oak forest and pine stands on rock outcrops. The middle part of the gorge is most impressive, where the valley floor is very narrow, locally just confined to the channel, valley sides are rocky, and greenschist cliffs are up to 20 m high. Educational trails were marked on the valley floor and the valley shoulders, one focused on nature, another one on archaeology. The valley is a popular place of weekend recreation.