Zumaia is a small town in the north of Spain in the Basque Country. Uniquely, town has two beaches (Itzurun and Santiago), which are of interest to geologists because they are situated among the longest set of continuous rock strata in the world. Known locally as the "flysch" they date from the mid-cretaceous period to the present, a time period of over 100 million years. The K-T boundary is present at the Itzurun beach, and fossils can be found, notably of ammonites. The strata stretches along a distance of about 8 km, between the towns/beaches of Deba and Getaria, with Zumaia lying in the middle.
The towns harbor is at the mouth of the Urola Ibaia, in the cul-de sac if the Bay of Biscay and has a notorious entry. Check it out!