Mariina skála, Sandstone viewpoint in Jetřichovice, Czech Republic.

Mariina skála is a sandstone rock summit in the České Švýcarsko National Park at 428 m above sea level, north of Jetřichovice. Its top holds a wooden shelter in the form of an open veranda, rebuilt in 2021 as a metal-and-wood structure and set in place by helicopter.

In 1856 Ferdinand Bonaventura, 7th Prince Kinsky, had a wooden shelter hut built on the summit, used by fire-watch patrols. The hill was named Marienfels after Marie Anna Kinsky, wife of the estate owner, replacing the older name Velký Ostrý. The hut burned in 2005 through visitor negligence and was renewed a year later; a new metal-and-wood shelter was flown up by helicopter in February 2021.

The hill was renamed Marienfels in the 19th century after Marie Anna Kinsky, wife of the estate owner; it had previously been called Velký Ostrý, in German Grosser Spitziger. The international long-distance hiking route E3 from Jetřichovice passes the rock and continues to Vilemínina stěna and Rudolfův kámen.

The climb starts from Jetřichovice village following marked hiking trails, with wooden stairs and handrails aiding the final ascent. The trails remain open year-round, though visitors should expect slippery conditions during wet weather.

The summit hut was rebuilt as a metal-and-wood structure in February 2021, flown up by helicopter because repairs to the mould-damaged wooden anchoring were impossible. The site draws around 100,000 visitors a year (as of 2020).