The castle of Bouka (Greek: Κάστρο της Μπούκας, from the Italian word bocca) was the first major Ottoman fortification of Preveza, in northwestern Greece. It was constructed by the Ottomans in 1478 and controlled the straits of the Ambracian Gulf. In 1701, the Venetians blew the castle up before they handed Preveza over to the Ottomans, according to the terms of the Treaty of Karlowitz.