Border between adriatic sea and ionian sea?

The border between the Adriatic Sea and the Ionian Sea is defined by the Strait of Otranto, a narrow channel of water that connects the two seas. The strait is located between Italy and Albania, and it is about 72 km (45 miles) wide at its narrowest point. The Adriatic Sea is located to the north of the Strait of Otranto, and the Ionian Sea is located to the south.