Castro Urdiales is a seaport located in the autonomous community of Cantabria in northern Spain. Situated along the Bay of Biscay, the town serves as a coastal hub with a long history tied to maritime activities.
While it is considered a modern town, Castro Urdiales features significant historical landmarks dating back to the Middle Ages, including its castle and the Gothic-style parish church of Santa María de la Asunción. The local economy is primarily driven by tourism, fishing, and the oil-packing of fish, specifically sardines and anchovies.
The town's proximity to the sea is reflected in its industrial heritage. The Lolin and La Castreña anchovy canning factories stand as notable landmarks representing the region's established involvement in the fish processing industry.