La Rochelle is a city on the west coast of France and a seaport on the Bay of Biscay, a part of the Atlantic Ocean. It is the capital of the Charente-Maritime department. With 78,535 inhabitants in 2021, La Rochelle is the most populated commune in the department and ranks fourth in the Nouvelle-Aquitaine region after Bordeaux, the regional capital, Limoges and Poitiers.

The Bay of Biscay is a gulf of the northeast Atlantic Ocean located south of the Celtic Sea. It lies along the western coast of France from Point Penmarc'h to the Spanish border, and along the northern coast of Spain, extending westward to Cape Ortegal. The southern area of the Bay of Biscay that washes over the northern coast of Spain is known locally as the Cantabrian Sea.