Andrejšky, Natural monument near Starý Plzenec, Czech Republic

Andrejšky is a 300-metre silicite rock ridge running north to south on the northwest slope of Radyně hill near Starý Plzenec. Its frost-weathered rocks stand 5 to 15 metres high, and a stone sea of large blocks lies on the eastern side of the protected area.

The site received official natural monument status in November 1975, establishing formal protection for this geological formation. This designation helped preserve the area from further development and damage.

The ridge lies on the Staroplzenecká educational trail, a circular route around Starý Plzenec, about one kilometre from the ruins of Radyně castle. Climbers use the rocks freely at any hour, and the Czech Mountaineering Association records 110 climbing routes in the Radyně sector.

The area is accessible via marked hiking trails and climbing routes starting from Starý Plzenec that connect to nearby Radyně castle. Wear sturdy footwear since the rocky ground is uneven and requires careful footing throughout your visit.

The rock formations contain material over 500 million years old, displaying layers of ancient marine sediments from prehistoric seas. These geological layers reveal a time when this entire region was covered by ocean water.