Slavičí údolí, Nature reserve in Lochkov district, Prague, Czech Republic

Slavichí Valley is a nature reserve in western Prague containing oak-hornbeam woodlands, open meadows, and a seasonal stream. The terrain spans about 38 hectares across slopes ranging from roughly 220 to 270 meters in elevation.

The area gained protection status in 1988 following scientific surveys of its geological formations and plant communities. This formal recognition secured its future as an important natural site.

Since 2000, sheep and goats have grazed the reserve under a project funded by Prague's city council, which manages similar pastures elsewhere in the city. The 2020–2029 care plan recommends continuing this grazing, supplemented by mowing tall dominant grasses.

There are no marked hiking trails; access is only via a few narrow footpaths, so a map or GPS helps. The reserve lies at 220–270 m in the Lochkov cadastre, above the Lochkov Tunnel and the Prague ring road. Skalní potok is dry most of the year and flows only after heavy rain.

The northern tip of the reserve exposes the Antipleura layer at the base of the Devonian, named after the bivalve Antipleura bohemica, whose fossils are common there. F. Fiala studied the pillow basalts in the 1950s and 1960s and described them in 1970.