1. Calanque de Sormiou is a stunning calanque (narrow, steep-walled inlet) located in Marseille, France. It is known for its crystal-clear turquoise waters, white sandy beaches, rugged cliffs, and natural beauty. The calanque is a popular spot for swimming, sunbathing, hiking, and rock climbing. It is also home to a variety of flora and fauna, including several rare and endangered species.

2. Calanque de Sormiou is open to visitors year-round. There is no phone number available for the calanque, as it is a natural site with no facilities or services. However, visitors can contact the Marseille Tourist Office for more information about the site and how to get there.

3. There is no admission fee for Calanque de Sormiou, as it is a public beach and natural site. However, visitors must purchase a parking pass in order to park in the designated lot near the calanque. The parking pass can be purchased online or at several locations throughout Marseille. In terms of transportation, visitors can take public transportation to the nearest bus stop and then hike down to the calanque, or they can drive and park in the designated lot. However, parking is limited and fills up quickly, especially on weekends and during peak tourist season.