Doutnáč, Mountain summit in Bohemian Karst, Czech Republic.

Doutnáč is a 433 m elongated ridge running north-south in the Karlštejn Highlands, within the Karlštejn National Nature Reserve in the Bohemian Karst. Its southern slopes are steep and carry a forest-steppe with the rare orchid Anacamptis pyramidalis, while the northern slope descends gently into beech woods.

In 2004, an agreement between the Bohemian Karst administration and Lesy České republiky, s. p., made Doutnáč a no-intervention area, completely removed from forestry. Wood was logged on its slopes in the past, yet the forest composition remains close to natural, which was one reason the hill was chosen for monitoring natural forest development.

No tourist path crosses Doutnáč, so the summit has no visitor tradition; its slopes were logged in the past, yet the forest composition stayed close to natural. Since 2004 the hill has been a no-intervention zone where fallen trees are left in place.

No tourist path crosses Doutnáč: the summit lies inside the NPR Karlštejn reserve and is closed to visitors, so it cannot be climbed from any direction. The site is a no-intervention zone where fallen trees are left in place, and access is reserved for forestry research.

No marked tourist trail crosses Doutnáč, which is one reason the hill was chosen in 2004 as a no-intervention zone: fallen trees are left to rot and the forest is to develop old-growth character over decades. Its southern slope holds a rare dry forest-steppe where the pyramidal orchid (Anacamptis pyramidalis) grows.