Otočec Castle is a castle hotel on a small island in the middle of the Krka River in Otočec, Slovenia. It is the only water castle in Slovenia. The castle was first mentioned in documents in the 13th century,[1] although the walls are said to date to the more precise date of 1252.[2] It was once owned by Ivan Lenković, the chief commander of the Croatia-Slavonia march. The writer Ivan Tavčar set two of his novels at the castle, Otok and Struga and Janez Sonce.[2] The islet is linked to both banks of the river by bridges and the castle has now been converted into a small hotel. Bradt Travel Guides[3] calls it "one of the most famous hotels in Slovenia."[4]