A diachronic study of the Mediterranean coastline: A geometric approach Fatima Zahra Salim, Mohamed Yassine El Habti, Khadija Ben Hamman Lech-Hab and Abdelkrim El Arrim E3S Web Conf., 234 (2021) 00039 Published online: 02 February 2021 DOI: 10.1051/e3sconf/202123400039