Hiking in Hendaye, France begins where the Pyrenees meet the Atlantic, with the GR 10 setting out near the long beach and the Château Observatoire Abbadia above the Corniche Basque. From the Bidassoa estuary to the headlands facing Hondarribia, trails here mix salt air, flysch cliffs, and the last sharp lift of the western Pyrenees, giving Hendaye a finish-line energy all its own.