Abstract
Abstract: The Gulf of Fonseca region is better known in Central America for the disputes in its boundaries that have opposed secularly the three littoral States of El Salvador, Honduras and Nicaragua. This article aims at understanding the border region of the Gulf of Fonseca through the interface concept, not limited to the mere entry of diplomatic confrontation between adjacent States, but to explore deeper the contact dimension that provides the interface. The case of the gulf of Fonseca is of great importance because it leads to propose the multiple dimensions of a complex interface, at the same time a multiscale and multidimensional interface: a politics interface in construction, an interface taken by civil society, and lastly an interface extended nowadays from a cross-border dimension to transnational dimension.