Bahía Magallanes is a coastal bay located within the larger Ría Deseado estuary system in Patagonia, Argentina. This saltwater environment features a mix of gravel and sandy substrates and presents a significant depth gradient, with the deepest waters found in the bay's eastern portion. The transition zone between Bahía Magallanes and the adjacent Bahía Uruguay is a noted area of interest for anglers and naturalists alike, offering dynamic conditions influenced by tidal currents. The bay supports a diverse benthic community, which forms the foundation of the local marine food web.