There is no doubt that the sea is a source of life for this typical and traditional fishing village. Deep-sea fishing is the main activity in the Bay of Biscay, and this is why Ondarroa's harbour is so important to the town's livelihood. Indeed, the town's entire atmosphere revolves around this activity. You can come here to see them unload the first catches of the day, and can even watch them selling the fish. To round off a day of fishing, nothing beats a walk around the harbour and in the old town. From here, you can cross the Artibai river via bridges built during various periods over the years: the Roman bridge, Hierro bridge, Perrotxiko bridge, and the bridge designed by Santiago de Calatrava that is the most modern of them all. If luck is on your side, you may be able to watch from one of the bridges as the young people of the town train or compete in boats on the river.