The remains of this once impressive castle lie between the villages of Petra and Nea Kerasounta in the south west corner of Preveza Prefecture. The current castle stands on the site of an ancient city of the Helian tribe known as Vouhetio. Roman, Byzantine and Venetian conquerors overtook the castle successively and made improvements. However, the castle was dealt its deathblow by the Turks during the Turkish-Venetian War at the end of the 17th century and what remained are the present ruins we can see today.