The average width of the sea is about 160 km. The Strait of Otranto joins the Adriatic Sea and the Ionian Sea and is only 85 to 100 km wide. The sea is very shallow. Its average depth is 240 m (133 fathoms). The sea is deepest east of Monte Gargano and south of Dubrovnik where it dips below 1,460 m (800 fathoms).