The Madriu-Perafita-Claror Valley is a glacial valley in the southeast of Andorra. It covers an area of 42.47 km2, approximately 9% of the total area of Andorra, and is part of the second largest watershed basin in Andorra. The isolated valley is recognised as a haven for rare or endangered wildlife, and the undeveloped valley has recently been considered to be the "spiritual heart" of Andorra. It became Andorra's first, and to date its only, UNESCO World Heritage Site in 2004, with a small extension in 2006.