Introduction to the Gironde Bay: Bordeaux is located on the left bank of the Garonne estuary. Its superior geographical environment makes it known as the Port of the Moon (Port de la Lune), calling ships sailing from all over the world. Although Bordeaux is an estuary port, it is protected by the Gironde Bay (Gironde), which is dozens of kilometers long and is protected from the direct impact of the ocean. The port is calm and vast, with both the unlimited expandability of the ocean and the vast hinterland of the plain city. , under these conditions, it naturally became an economic center.