The reconstruction of the Urartu civilization (IX-VII centuries BC) has been the main issue of an interdisciplinary project carried on since 1994 by the 'Istituto per gli Studi Micenei ed Egeo-Anatolici' (ISMEA) of the National Research Council (CNR), in collaboration with the Institute of Archaeology of the National Academy of Sciences of Republic of Armenia (IANAS). The Urartian kingdom, at its maximum expansion, encompassed the present eastern Turkey, Armenia and Iranian Azerbadjan. One of project target is the region of Lake Sevan, as the northeastern periphery of the Urartian State. Lake Sevan lies, nowadays, in a closed basin, surrounded by mountain ranges. Between the 6the millennium BC and today, four cycles of transgression and regression have been detected. In the Sevan basin these flows fluctuations are also due to local volcanic phenomena. Therefore, one of the key problems of the investigation has been the definition of the lake level in different periods, biasing the inhabitants distribution and the environment exploitation. To fulfil this task, contour lines (100 m step) of 1:100,000 scale topographic sheets were first interpolated obtaining as result a Digital Elevation Mode (DEM), analyzed to gain insight to the territorial relationships among the archaeological sites. Moreover, by processing ERS SAR images acquired in different dates, the geo-environmental setting of the southern Lake Sevan region has been investigated, by using also interferometry techniques to create a more detailed DEM.