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The N-121 heads north over the Puerto de Belate (847m). The road then splits in two the eastern branch following the Valle del Baztan and into France by the Puerto de Otxondo (602m).
The western branch turns west below the Parqu Nacional de Bertiz. It then turns north up the valley of the Rio Bidasoa to Irun and the Autopista AP-8.
National road N-121