Údolí Oslavy a Chvojnice, Nature reserve across Vysočina and South Moravian regions, Czech Republic
Údolí Oslavy a Chvojnice is a protected area stretching along the Oslava River for several kilometers from Náměšť to Čučice and including the Chvojnice tributary. The terrain features steep canyons with cliff walls, meadows, and forest patches that together create a mosaic of different habitats.
The valley's medieval castles—Lamberk, Levnov (Ketkovický hrad), Sedlec and Kraví hora—stand as ruins above the Oslava and Chvojnice. The area was later declared a nature reserve; on 1 December 2019 the Divoká Oslava national nature reserve was created within it, while the existing reserve remains in place.
The valley's name comes from the Oslava and Chvojnice rivers, whose confluence lies beneath the Levnov castle ruin, also called Ketkovický hrad. Three old water mills survive in the valley — Skřipinský, Senoradský and Ketkovický — and the red-marked trail passes the first two.
Trails run through demanding terrain along the river, and at several points hikers must wade across the water. The best access is from Náměšť nad Oslavou, reachable by train on the Brno–Jihlava line, then along the red-marked path via Lamberk ruin to the Skřipinský and Senoradský mills.
The reserve's botanical survey recorded about 800 vascular plant species. The orchid Himantoglossum adriaticum has here one of its few recent sites in the Czech Republic, and the moss Dicranum viride also grows in the reserve; the survey likewise found the beetle Lapulla semicincta.
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