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In page Languages of Europe:

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  • The Basque language (or Euskara, c. 750,000) is a language isolate and the ancestral language of the Basque people who inhabit the Basque Country, a region in the western Pyrenees mountains mostly in northeastern Spain and partly in southwestern France of about 3 million inhabitants, where it is spoken fluently by about 750,000 and understood by more than 1.5 million people. Basque is directly related to ancient Aquitanian, and it is likely that an early form of the Basque language was present in Western Europe before the arrival of the Indo-European languages in the area in the Bronze Age.[citation needed]
  • The Northwest Caucasian family (including Abkhaz and Circassian).[citation needed][1]