Maó-Mahón, is a municipality, the capital city of the island of Minorca, and seat of the Island Council of Minorca. The city is located on the eastern coast of the island, which is part of the autonomous community of the Balearic Islands, Spain. Maó-Mahón has one of the largest natural harbours in the world: 5 km (3.1 mi) long and up to 900 metres (2,953 feet) wide. The water is deep but it remains mostly clear due to it being slightly enclosed. It is also said to be the birthplace of mayonnaise.