The results of the survey are particularly encouraging, as they brought to light new facts about the Middle Helladic and Early Mycenaean background of the settlements developed on the northern margin of the lake. In addition, the finding, with stratigraphic data, that the fortified settlements in the hills of Agios Ioannis and Aghia Marina have a phase of fortification, rehousing and abandonment chronologically analogous to the acropolis of Gla, ie around the middle of the 13th century BC, a milestone of the problems of the socio-political hierarchical relations of the Mycenaean northeastern coppaid field, as well as of the Orchomenos-Glas...