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 Italian Riviera or Ligurian Riviera is the narrow coastal strip in Italy which lies between the Ligurian Sea and the mountain chain formed by the Maritime Alps and the Apennines. Longitudinally it extends from the border with France and the French Riviera near Ventimiglia eastwards to Capo Corvo which marks the eastern end of the Gulf of La Spezia and is close to the regional border between Liguria and Tuscany. The Italian Riviera thus includes nearly all of the coastline of Liguria. Historically the "Riviera" extended further to the west, through what is now French territory as far as Marseille.