Roztocký háj - Tiché údolí, Nature reserve in Roztoky, Czech Republic.

Roztocký háj - Tiché údolí is a nature reserve near Prague located where a creek meets a river, featuring diverse habitats and limestone structures. The area consists of forested slopes and open grasslands that support different plant and animal communities.

The area was protected as a state nature reserve on 9 September 1951 by the Czechoslovak Ministry of Education, Sciences and Arts. A broader protection decree followed on 30 December 1988, and a Ministry of the Environment regulation of 11 June 1992 made it a nature reserve on 13 August 1992. Archaeological finds document settlement from the Neolithic around 5000 BC, including over 70 Únětice culture graves with grave goods and a hoard of seven decorated bronze daggers.

From the 1870s until World War I, Tiché údolí was the first summer resort of Prague residents, who built luxury villas here that are now cultural monuments. These include Japanese-style buildings of the traveller Joe Hloucha, Neo-Renaissance summer houses linked to Bedřich Smetana and Franz Kafka, and several mills. The painter Zdenka Braunerová made Braunerův mlýn a centre of cultural life, hosting guests from the National Theatre generation.

A marked walking trail winds through the reserve with information stops along the way to help visitors learn about the environment. Public transportation connects the area easily to the city, making a day visit straightforward and convenient.

The reserve protects several rare animal species, including a green lizard species that thrives in the dry grassland areas. These special habitats developed through the interaction of the river, limestone geology, and centuries of human activity in the landscape.