Marismas del río Palmones y playa de El Rinconcillo Nature · Algeciras, Campo de Gibraltar, Cádiz The marshes of the Palmones river, on the boundary between Algeciras and Los Barrios, form an extensive dune spit that gives rise to the Algeciras beach of El Rinconcillo, one of the last preserved natural areas of the bay. Photo: Raquel Sánchez de Pedro (CC BY-SA 3.0 es) What to see and do in Algeciras