Centre International de Rencontres Mathématiques

The 9th arrondissement of Marseille is one of 16 arrondissements of Marseille. This district is the largest in the city. The 9th arrondissement borders the 8th, 10th and 11th arrondissements. It is governed locally together with the 10th arrondissement, with which it forms the 5th sector of Marseille.

Aix-Marseille University Faculty of Sciences is one of the faculties of Aix-Marseille University. The faculty is divided into seven departments across six campuses. With 8000 students and 1600 staff and faculty it is one of the largest science faculties in France. The notable faculty include Carlo Rovelli.

The École nationale supérieure d'architecture de Marseille-Luminy is a French school of architecture.

The Massif des Calanques (French pronunciation: ​[masif de kalɑ̃k]) is a wild and rugged terrain stretching from the ninth arrondissement of Marseille to the east towards Cassis, spanning 20 km in length and 4 km in width along the coast. Its highest peak is Mont Puget at 565m. The area has been protected by a national park since 2012.

Mont Puget is a mountain, part of Marseille-Cassis calanques, located south-east of Marseille. Like most Marseille mountains, it is formed from limestone.

The Calanque de Morgiou is one of the biggest calanques located between Marseille and Cassis. Formerly a fishing port, it is famous for the gigantic tuna fishing organized there in 1622, when the king Louis XIII paid a visit to Marseille. It still houses small fishing cabins, but they're now used for tourism rather than fishing. The Calanque de Morgiou is also famous for the Cosquer cave, an underwater grotto containing numerous cave drawings dating back as far as 27,000 years BP.

The Calanque de Sugiton is one of the numerous Calanques located between Marseille and Cassis, France. While quite small, Sugiton is perhaps the most known of all Marseille Calanques, simply because it can be easily accessed by hikers, starting from Luminy University Campus, and because it is open to tourists even during hot season, unlike most Calanques. In fact, during summer most of the Calanques are closed because of high fire risk. A small beach can be found at the extremity of the calanque.

Calanques National Park (French: Parc national des Calanques) is a French national park located on the Mediterranean coast in Bouches-du-Rhône, Southern France. It was established in 2012 and extends over 520 km2 (201 sq mi), of which 85 km2 (33 sq mi) is land, while the remaining is marine area. It includes parts of the Massif des Calanques stretching between Marseille, Cassis and La Ciotat. Some of the park's best known features include the Calanque de Sormiou, Calanque de Morgiou, Calanque de Port-Miou, Calanque de Sugiton and Cosquer Cave.

The Calanque de Sormiou is the biggest calanque of the Calanques National Park, France. Located in the 9th arrondissement of Marseille, it is famous for its climbing spots. Access by car is restricted in the summer due to the risk of forest fires.

The Cosquer Cave is located in the Calanque de Morgiou in Marseille, France, near Cap Morgiou. The entrance to the cave is located 37 m (121 ft) underwater, due to the Holocene sea level rise. The cave contains various prehistoric rock art engravings. Its submarine entrance was discovered in 1985 by Henri Cosquer, a professional diver. The underwater passage leading to the cave was progressively explored until 1990 by cave divers without the divers being aware of the archaeological character of the cave. It is only in the last period (1990-1991) of the progressive underwater explorations that the cave divers emerged in the non-submerged part of the cave. The prehistoric paintings were not immediately discovered by the divers to first emerge from the other side of the sump. The cave was named after Henri Cosquer, when its existence was made public in 1991, after three divers became lost in the cave and died.

A calanque (French: [kalɑ̃k], "inlet"; Corsican: calanca, plural calanche or calanchi; Occitan: calanca, plural calancas) is a narrow, steep-walled inlet that is developed in limestone, dolomite, or other carbonate strata and found along the Mediterranean coast. A calanque is a steep-sided valley formed within karstic regions either by fluvial erosion or the collapse of the roof of a cave that has been subsequently partially submerged by a rise in sea level.

Baumettes prison (also known as the Centre pénitentiaire de Marseille) is a prison in the 9th arrondissement of Marseille.