Krňov, Natural monument in Prague, Czech Republic

Krňov is a former arm of the Berounka River beneath Zbraslav Castle, now a still backwater fed by the Lipanský Stream. Together with floodplain forest, wetlands and the Vltava bank from Lahovice to Strnady it forms the Krňák natural monument. A reinforced-concrete bridge of 1911–1913 crosses the old channel.

The channel through Lipence and below Zbraslav is the Berounka's original bed. After the 1845 flood the river largely left its Zbraslav arm, and the 1872 flood silted up the old channel, creating the blind arm Krňák. In 1873 the adjacent Vltava stretch was regulated, and the Lahovice and Modřany islands disappeared.

Local schools and nature enthusiasts visit this place to study native plant species and the geological features of the Prague region. For residents, it serves as a place where you can connect with the natural heritage found right in the urban landscape.

The site is accessible via marked hiking trails with informative signs explaining local natural features and protective regulations throughout the area. Sturdy footwear is recommended for walking the varied paths comfortably.

The site combines city location with natural protection, allowing researchers to study plant species and rock formations directly within Prague's limits. This mix of urban space and natural features is rarely found in a major capital city.