The mesa is composed of Cretaceous sandstone, which has been weathered into iconic block structures over millions of years.
During the 17th-century Counter-Reformation, the caves served as a secret refuge for Czech Brethren Protestants who gathered to hold prohibited religious services.
Ostaš serves as a major hub for bouldering in the Czech Republic, with hundreds of registered high-quality sandstone problems.
The summit plateau offers panoramic views of the Broumov Walls and the peaks of the Krkonoše mountains.
The rock town features unique microclimates where cool air is trapped, allowing certain alpine plant species to grow at lower-than-usual elevations.
Ostaš is a mesa mountain located in the Broumov Highlands of the Czech Republic, known for its intricate sandstone labyrinth formations. The area is divided into two primary circuits: the upper rock town and the lower rock town, known as Sluje českých bratří (Caves of the Czech Brethren). The plateau reaches an elevation of 700 meters above sea level and features significant vertical rock walls, narrow crevices, and natural observation points. Vegetation consists primarily of mixed forests, with spruce and pine dominating the higher altitudes. The site is a protected area, strictly managed to preserve the unique geological microclimate within its crevices. It is a popular destination for bouldering and rock climbing, with specifically designated zones for these activities. The terrain includes steep staircases and narrow passages carved into the sandstone, requiring moderate physical agility.
Frýdlantská vyhlídka observation point, offering the most expansive view over the Metuje River basin.
Wear footwear with high-traction soles as the sandstone paths can be slippery, especially near cave entrances.
Bring a headlamp if you plan to explore the deeper sections of the Sluje českých bratří circuit.
Follow marked tourist trails strictly, as the surrounding rock formations are fragile and prone to erosion.
Attempting the narrow rock passages with large backpacks or children who cannot navigate steep, uneven stone stairs.
Stick to marked trails to prevent damage to the soft sandstone; climbing is only permitted in clearly designated bouldering zones.
