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The purpose of this paper was to highlight aspects related to the influence of the natural environment, in the Lower Sector of the Danube, to the distribution of fortresses and fortified settlements. Although the human settlements in this sector have been the subject of numerous studies, we noted the absence of a unified presentation of the fortresses and fortified settlements on the Ostrov-Tulcea sector of the Danube. For this purpose, the citadels and fortified settlements, known and registered in the National Archaeological Register, in the Ostrov-Tulcea sector were targeted. All this information has been georeferenced and integrated into the free GIS application Quantum GIS. [ABSTRACT FROM AUTHOR]