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The main objective of this paper is to contribute to the knowledge of the topography of the city of Cartagena in the early Roman Empire times. A Geographic Information System has been used with data from numerous archaeological excavations, available historic maps and new GPS observations referred to landmarks of that era that are currently on the soil surface. Some meaningful results are: the compilation of spatial information from different sources in a single database, the creation of thematic maps and the generation and analysis of digital elevation models based on these data, which were compared with the contemporary ones. Some notable conclusions are the generation of a methodological model, the contribution to systematic knowledge of the historical topography of Cartagena and the interest of expanding the area of study and considering other periods. [ABSTRACT FROM AUTHOR]