Kadovský viklan, Nature reserve near Kadov, Czech Republic

Kadovský viklan is a protected natural monument in Kadov near Blatná, Strakonice District, declared in 1985. It protects a granodiorite rocking boulder, one of the largest in the Czech Republic, weighing just under thirty tonnes and resting on a smaller base stone about 200 metres from the village centre.

The granodiorite boulder was protected as a natural monument in 1985. An unknown vandal toppled it from its original position in 1893; in 1983 six men led by Pavel Pavel, using only wooden levers and wedges, raised the nearly thirty-tonne rock and returned it to its place. It was knocked over and reset several times afterwards, most recently in 2023.

The name viklan comes from the Czech word for a rock that rocks or sways on its base. The boulder is a granodiorite block weighing just under thirty tonnes, and it is one of the largest balancing rocks in the Czech Republic. It stands about 200 metres from the centre of Kadov, near the village office.

A marked educational trail with 13 stops guides visitors through the nature reserve to reach the boulder formation. Wearing sturdy footwear is recommended, as the path crosses natural terrain and conditions can vary depending on the weather.

The 1983 re-erection was led by Pavel Pavel, an engineer from Strakonice who later became known for testing how the moai of Easter Island could have been moved. Six people with wooden levers and wedges raised the nearly 30-tonne boulder. It was toppled again and last reset in 2023.