Protected by the Parc National des Calanques, Les Calanques de Marseille, a series of pine-tree spotted limestone hills that spill into a cobalt blue sea, are not to be missed if you want to swim in Provence. They are accessible by foot from the centre of Cassis, via the GR 98. On the Côte Bleue side, make a splash in the wild, tree-lined Calanque de Méjan. With its island jewels of the Îles d’Or, Porquerolles, Port-Cros and Le Levant, the Parc national de Port-Cros, has plenty of turquoise calanques which will enchant swimmers and lovers of lazy days. To enjoy their beauty in total tranquility, dive in off-season.