Explore details about location La Serena - Paso Agua Negra (Frontera San Juan). La Serena - Paso Agua Negra (Frontera San Juan) is a location situated within the Vicuña alongside other areas such as Cruce Ruta 41 Ch - Cruce Ruta D-355, La Serena - Paso Agua Negra (Frontera San Juan), Los Copihues.