Just what the title says. Is it possible that Basque fishermen/whalers/whatever could have reached and settled Iceland before the Norse? I have a vague recollection that the Basques had dealings with Iceland several centuries after it was settled, and were also active in Newfoundland. But I'm interested in the period before 900 AD. I think Basque whalers were already active in those days.
And if not Iceland, what about the Faroes or the Hebrides? Basically I'm wondering if there was any place outside of the Basque country that the Basques could have plausibly settled and become the majority.