Which language isolate is spoken in the western Pyrenees?

Basque is a language spoken by Basques and other residents of the Basque Country, a region that straddles the westernmost Pyrenees in adjacent parts of southwestern France and northern Spain. Basque is the only known language isolate in all of Europe. The Basques are indigenous to and primarily inhabit the Basque Country. Basque has 806,000 speakers: 93.7% (756,000) are in the Spanish area of the Basque Country and the remaining 6.3% (51,000) are in the French portion.