Лигурия теңізі: Италия мен Корсика арасындағы Жерорта теңізінің бөлігі

Arm of the Mediterranean Sea between the Italian Riviera (Liguria) and the island of Corsica

The Ligurian Sea (; ; ; ) is an arm of the Mediterranean Sea. It lies between the Italian Riviera (Liguria) and the island of Corsica. The sea is thought to have been named after the ancient Ligures people.

The sea borders Italy as far as its border with France, and the French island of Corsica. In the east, the sea borders the Tyrrhenian Sea, while in the west it borders the Mediterranean Sea proper. Genoa is the most prominent city in the area. The northwest coast is noted for its scenic beauty and favourable climate. The Gulf of Genoa is its northernmost part. The ports of Genoa and La Spezia are on its rocky coast. It reaches a maximum depth of more than northwest of Corsica. According to a 1983 study, since 1977 a series of experimental analyses on sea level variations at Genoa and Imperia highlighted "the existence of a seiche wave with a mean period of 5.8 hours", whose reasons weren't yet explained at that time. The Ligurian Sea was modeled as a rectangular semi closed basin with a longitudinal length of and a transversal one of , in an average constant depth of .

The Ligurian Sea is attraversed by the Modified Atlantic Water (MAW) on its surface and by the Levantine Intermediate Water in depth. It is also brushed by the two main currents which surround the Corsica island: the Western Corsica Current and the Tyrrenian current that reaches the Corsica Channel.

In order to provide protection for the numerous cetacean (whales and dolphins; porpoises are not found in this part of the Mediterranean Sea) species in the Ligurian Sea the bordering countries established the sea as a SPAMI in 1999. The International Ligurian Sea Cetacean Sanctuary now covers covering territorial waters as well as high sea.