The French postal programme for Andorra includes a €2.25 stamp for the cross-border GRT 1 route, part of a joint issue with Spain and France. The route links Ariège, Pallars and Andorra through the Alt Pirineu, Comapedrosa and Pyrénées de l’Ariège parks. The trail can be walked in three to five stages.

Clàudia Llevet designed the 60 × 48 mm stamp. The gravure-printed 105 × 71.5 mm block carries one international-letter stamp; the announced printing is 40,000. Philaposte scheduled a Paris salon preview for 5–7 November with cancellation available on site.