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The water gap of Młynówka river in the south-eastern part of the Kaczawskie Foothills, between the village of Nowa Wieś Wielka in the west and the forest settlement of Siedmica in the east is known under the name of Siedmica Gorge (Wawóz Siedmicki). Nature reserve established here in 2001, extending across an area of 68 ha, bears the same name. It encompasses not only the water gap itself, but also the adjacent sections of the valley and large portions of the neighbouring upland. Forest communities are of primary botanical interest. Oak forest is dominant on steep slopes, with dwarfed and twisted oaks adjusted to the scarcity of water and unstable ground. In more humid places, but still fairly steep, oak is replaced by maple and lime. Along the Młynówka river in the eastern part of the reserve riparian forest with ash and alder occurs, locally giving way to willows and reeds. In more fertile places Molinia meadows have developed. Altogether, more than 250 plant species were recorded within the reserve, including 19 under protection. Newt is common among animals. Geologically the gorge of Młynówka was carved in greenschists which are altered submarine lavas of basaltic composition. Well preserved original pillow lava structures are exposed in crags which dot the valley sides. Oval pillows are up to 50 cm long and 20 cm thick, arranged parallel to themselves. Rock towers, cliffs and pulpits reach 20 m high.