The Madriu-Perafita-Claror Valley is an exceptional geographical unit located in the south-eastern part of Andorra, in the heart of the Pyrenees. It covers more than 9% of the national territory.
The upper part of the valley is an exposed glacial landscape, with spectacular steep cliffs, rock and lake glaciers. Lower down, the valley narrows and becomes more wooded, while in its lowest section the river flows into a short gorge. A secondary valley, the Perafita-Claror Valley, merges with the Madriu Valley from the South-West.
Postal services in Andorra are not operated by its two larger neighbouring countries, Spain and France. This postcard travelled through the Spanish mail system.