Why are harbor entrances between breakwaters kept as narrow as practical?

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Harbors and sea works Yachting harbor at Lorient, France.

In the context of maritime engineering, harbor entrances between breakwaters are kept as narrow as is practically possible to ensure the effectiveness of the harbor as a sheltered basin.

The primary function of a breakwater is to provide calm water inshore for the protection of ships. By minimizing the width of the entrance, engineers reduce the amount of wave energy that can penetrate the harbor, thereby maintaining the necessary tranquility within the enclosed area for safe anchorage and port operations.1