The geographical peculiarity of Lesbos island has determined its history and destiny. The two gulfs, those of Gera and Kalloni, have played a predominant role in the formation of the urban tissue of the island. From a geological point of view, Kalloni Bay belongs to a tertiary volcanic formation and has important flint stone deposits, which supplied the material for vast exploitation during the Neolithic and the Early Bronze Age. This article presents the sites of the Early Bronze Ageare that located in the area of the Kalloni Bay and stresses the importance of the Skepasto site, which is equal to that of Kourtir.