The nation's new body: the Oficina de Longitudes and the national maps, 1902-1931.During the first decades of the 20 th century, the international land boundary treaties that shaped the Colombian political map were signed and executed.This thesis wonders about the role of national maps in the making of a territorial image of the Colombian state between 1902 and 1931.Firstly, a balance of the period's cartographical panorama is presented, and it is found that the main actor, but by no means the only one, was the Oficina de Longitudes.After exploring its history, methodology, and works, three of their maps are comparatively analyzed and the ways in which these and other maps circulated in media, such as the press and film, are explored.Throughout the thesis it is argued that the modernization of Colombian cartography led by the Oficina de Longitudes was not able to produce a single, stable, and iconic image of the national territory, but it did stablish the scientific and diplomatic basis for the construction of a depiction of the geo-body of the Colombian nation.It is also argued that the Oficina did not hold the monopoly of neither the production nor the circulation of cartography, rather, for the time of study a rich and complex panorama, that included non-scientific maps and critic views that contrasted with their official cartography, was configured.