The Château d'If is a fortress located on the Île d'If, the smallest island in the Frioul archipelago, situated about 1.5 kilometres offshore from Marseille in southeastern France. Built in the 16th century, it later served as a prison until the end of the 19th century. The fortress was demilitarized and opened to the public in 1890. It is famous for being one of the settings of Alexandre Dumas's adventure novel The Count of Monte Cristo. It is one of the most visited sites in the city of Marseille.

Marseille or Marseilles is the prefecture of the French department of Bouches-du-Rhône and capital of the Provence-Alpes-Côte d'Azur region. Situated in the Provence region of southern France, it is located on the coast of the Gulf of Lion, part of the Mediterranean Sea, near the mouth of the Rhône river. A resident of Marseille is a Marseillais.