Covering nearly 1200 kilometers , the demarcation line crossed thirteen departments: Basses-Pyrénées (Pyrénées-Atlantiques since 1969), Landes, Gironde, Dordogne, Charente, Vienne, Indre-et-Loire, Loir-et-Cher, Cher, Allier, Saône-et-Loire, Jura, and Ain.