Split shot of underwater scenery in Port-Cros National Park in the Mediterranean Sea, South France.

© Sabrina Inderbitzi/Shutterstock

Parc National de Port-Cros

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France’s first marine national park, dating to 1963, Port-Cros boasts exceptional marine fauna and flora, which makes it a snorkelling paradise. It comprises 17 sq km of land (mainly the Île de Port-Cros and Île de Port-Cros and Île de Poquerolles), and 29 sq km of surrounding marine environment.