In the event the ice ages receded and the 1st human groups roamed the humid valleys of the Cantabrian Sea, the lands we now simply call Euskal Herria had been already a refuge

Basque Region Cities Tale

I. In the Dawn of Time
Once the ice ages receded and the 1st human teams roamed the humid valleys with the Cantabrian Sea, the lands we now call Euskal Herria were currently a refuge. Within the caves of Santimamiñe, Ekain, Isturitz, and Aitz