This image shows the world famous island location of Château d’If, the site of the events in the novel ‘The Count of Monte Cristo‘ by Alexandre Dumas. The work ‘if’ is the French word for the yew tree, once common on the now barren island.

There is no description on the back of the card. There are regular visits to the island from tours departing Marseille harbor, including both inside and outside the main structure as shown here.
This postcard was used, but the postmark is illegible. However, the stamp is still present and was originally released in 1937. Combined with the restrictions of war time tourist travel by 1940, this image likely dates from the 1930s.