Following the C-443 until it reaches the C-141 will take you to Galizano, where you have to choose how you want to get to Somo, the next landmark on this section:
The official Northern Way goes around Galizano again onto the C-141 and it continues towards the church of Nuestra Señora de Latas, some 4 kilometres away from the starting point. You have to cross a residential area to reach the centre of Somo. An alternative route involves walking along the coast, towards the beach of Galizano and then by the sea through Loredo until you reach Somo. This is a beautiful spot with beaches and cliffs such as the one in Langre.
You can take a regular ferry from the pier at Somo to Santander. This is the capital of Cantabria, presided over by the beaches of the Sardinero, a beautiful esplanade leading to the Palacio de la Magdalena. In the city centre, you have the Cathedral of Nuestra Señora de la Asunción.