Gulf of Koper Gulf of Koper The Gulf of Koper or Koper Bay (, , ) is located in the northern part of the Adriatic Sea, and is a part of the Gulf of Trieste. The gulf, named after the city of Koper, is part of the Slovene Riviera and is entirely located in Slovenian territory. Crossed by the river Rižana, it is 18 km² large and spans from Debeli Rtič, next to the borders with the Italian town of Muggia; to Rt Madona, a cape in the town of Piran, that is also the northernmost point of the Gulf of Piran. The
Gulf of Aden of Berbera", named after the ancient Somali port city of Berbera on the south side of the gulf. However, as the city of Aden grew during the colonial era, the name of "Gulf of Aden" was popularized. The waterway is part of the important Suez Canal shipping route between the Mediterranean Sea and the Arabian Sea in the Indian Ocean, with 21,000 ships crossing the gulf annually. The name of the Gulf was inspired by the former British Crown Colony city of Aden, now part of Yemen. The Somali names are Gacanka Cadmeed or Gacanka Berbera. The International Hydrographic Organization