EN
The Roman fort at Iža was a strategic advanced site of the Limes Romanus/Ripa Pannonica defence system opposite Brigetio, on the northern bank of the Danube. So far there have been no targeted researches about the direct documents concerning supply and communication modes used in this site (in the context of the adjacent defence system). Historical records and early archaeological researches described walled structures with various interpretations (cloaca, pier). According to their position with regard to river course, it is possible to assume that such structures were used for bank defence purposes or as constructions of an independent port. In order to find an answer to this question, the authors of this paper have exploited both traditional and innovative methods (LIDAR, various types of sonars).