Provence-Alpes-Côte d'Azur daily basis, but cities are investing in public transport networks such as Marseille's subway (2 lines) and tramway (3 lines), Aubagne's tramway (1 line) and Nice's tramway (1 line). Other networks existed at the beginning of the 20th century in smaller cities such as Aix-en-Provence, Avignon, La Ciotat and Toulon but are now gone. Major universities of the region include the Aix-Marseille University, the University of Toulon, the University of Avignon and the University of Nice Sophia Antipolis. Other towns have higher education classes but no Universities. Provence-Alpes-Côte d'Azur Provence-Alpes-Côte d'Azur (; ; ; PACA) is one of the 18
Alpes-de-Haute-Provence the population, 32.8% of available housing in the department are second homes. The department of Alpes-de-Haute-Provence is one of the least densely populated of France with barely more than 20 inhabitants per km. The population is concentrated mainly in the valleys of the Durance, the Bléone (up to Digne) and the nearby flat lands. The rest of the department is sparsely populated (less than 10 inhabitants per km over most of the territory). Half of the Communes have less than 200 inhabitants, 17 communes have less than 50 and many villages have been abandoned. The towns are small: only Digne-les-Bains