Cabedelo area near Viana do Castelo has two spots dedicated to overnight campers' parking. The camping is set across the river from the city of Viana do Castelo. The Igreja on the hilltop looks even better from apart.
The larger camping area is set right next to the water with the view of the bay and the dedicated dumping station capable of accommodating two campers at once.
The second spot is much smaller, set on the top with slightly better view of the ocean.
Area location. The ferry to take you to the city is nearby as well.