The Ligurian Sea is an arm of the Mediterranean Sea, between the Italian Riviera (Liguria and Tuscany) and the islands of Corsica and Elba. The sea is probably named after the ancient Ligures people.
The sea borders the countries Italy, France, and Monaco. In the east the sea borders the Tyrrhenian Sea, while in the west it borders the Mediterranian Sea proper. Genoa is the most prominent city in the area. The northwest coast is noted for its scenic beauty and favourable climate.

The Ligurian Sea is called "Mar Ligure" in Italian and "Mer Ligurienne" in French.

2012

 Boat owners / users (including foreign visiting yachts) will be subjected to a daily tax for the duration of their stay within Italian waters. This will come into effect on the 1st May 2012 and the proposed tax per day is as follows:
- €5 - from 10,01m to 12m;
- €8 - 12,01m to 14m;
- €10 - 14,01m to 17m;
- €30 - 17,01m to 24m;
- €90 - 24,01 to 34m;
- €207 - 34,01m to 44m;
- €372 - 44,01m to 54m;
- €521 - 54,01m to 64m;
- €703 - above 64m.

At present this is only a Bill that is to be presented to the Italian Parliament and is not yet law.

Les limites arbitraires de la mer Ligure sont en général définies comme suit :

• limite occidentale : suivant une ligne joignant le cap Ferrat près de Nice et la Pointe de la Revellata près de Calvi en Haute-Corse ;
• limite orientale : suivant une ligne reliant le Cap corse (au niveau de Capu Sagru) et le promontoire de Piombino.

Elle borde la France, l'Italie et la principauté de Monaco. Elle se trouve au nord de la mer Tyrrhénienne et à l'est du Golfe du Lion.

Il mar Ligure è una parte del mar Mediterraneo centro-settentrionale. Morfologicamente è limitato ad occidente da un linea immaginaria che parte da cap Ferrat presso Nizza fino a Punta di Revellata vicino Calvi nella Corsica settentrionale, mentre il limite orientale può essere individuato tra capo Corso e il promontorio di Piombino.