Italy is surrounded by the Mediterranean Sea, in particular by the Adriatic Sea to the northeast, the Ionian Sea to the southeast, the Tyrrhenian Sea to the southwest, and the Ligurian Sea to the northwest. There are 7,600 km (4, 720 miles) of coastline in Italy.

There is almost no spot in Italy that lies farther than 120 kilometers (75 miles) from a coastline. At its deepest point, the Ionian Sea reaches a depth of 4.4 kilometers (2.75 miles), the greatest depth recorded in Mediterranean waters.

At the northern end of the Adriatic Sea is the Gulf of Venice; to the south the Strait of Otranto connects it with the Ionian Sea. The large Gulf of Taranto in the Ionian Sea is located between the "toe" and "heel" of the Italian "boot." The narrow, funnel-shaped Strait of Messina connects the Ionian and Tyrrhenian Seas, separating Sicily from the Calabria region, at the tip of the Italian peninsula.

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