The question asks where the Basque separatist organisation (commonly known as ETA - Euskadi Ta Askatasuna) is active.The Basque Country (Euskadi) is an autonomous community located in northern Spain, bordering France.ETA was an armed organisation that sought independence for the Basque Country from Spain (and sometimes including parts of France). It was most active from the 1960s until its ceasefire in 2011 and dissolution in 2018.Therefore, the Basque separatist organisation was primarily active in Spain.