Greece is a unitary parliamentary republic comprising 13 regions subdivided into 332 municipalities. It has a land area of 131,957 km2 (50,949 sq mi) and a population of approximately 10.5 million. The growing interest in sustainable urban mobility planning has led to the establishment of a unit within the Ministry of Infrastructure and Transport in 2017, which was dedicated to the development of SUMPs in Greece. Law 4784/2021 defines a SUMP based on the definition in the ELTIS SUMP guidelines. SUMPs can be developed by Municipalities and they are mandatory for Municipalities with over 30,000 inhabitants,