Resumen: For a century, the Beagle Channel was a point of contention for Chile and Argentina concerning their borders in the southern zone. Its geographical location implied a dispute between both nations' opposing geopolitical interests. This article analyzes the dispute over the Beagle Channel through a qualitative methodology with an established timeline (1881-1984). To this end, it assumes a geopolitical approach, resourcing the treaties and agreements established during this time and Chilean and Argentine authors defending the interests of their respective countries. As a result, it establishes the implications in the Austral-Antarctic Sea and the consequences in the maritime and continental shelf domains, which persist to this day.