Sidrište Knežak is situated in the narrow channel between Otočić Knežak (44°02′N 15°08′E) and the coast of Otok Iž close W, to which it is connected by a narrow bank, least depth 3·7 m in the fairway. Anchorage in sand, N of the narrow bank during a Scirocco, or S of the narrow bank during a Bora.