Książ Castle (pronounced: Ksyonsh [ˈkɕɔ̃ʂ], Polish: Zamek Książ, German: Fürstenstein) is the largest castle in the Silesia region, located in northern Wałbrzych in Lower Silesian Voivodeship as well as Poland's third largest castle behind only Malbork Castle and Wawel Castle. It lies within Książ Landscape Park, a protected area located in the Wałbrzyski Foothills. The castle overlooks the gorge of the Pełcznica river and is one of the Wałbrzych's main tourist attractions.