Keur Massar department is one of the 46 departments of Senegal, located at the entrance to the Cap-Vert peninsula, east of Dakar.
The city was made into a department on 28 May 2021 by President Macky Sall, thus becoming the <abbr>46th department</abbr> of Senegal.
The department has a population of 760,000 inhabitants (2023 census).