Explore details about location San Martín. San Martín is a location situated within the Portezuelo alongside other areas such as San Martín, Chillán - Portezuelo - Ñipas, San Martín. Additionally, some smaller parts of San Martín include specific areas like Pedro de Valdivia, Chillán - Portezuelo - Ñipas adding to the diversity of its landscape.