The Pyrenees traditionally form part of the boundary between France and Spain.
The Pyrenees extend for about 491 kilometres from the Bay of Biscay in the west to the Mediterranean Sea in the east. The range includes the independent microstate of Andorra and separates the Iberian Peninsula from the rest of continental Europe.
The highest peak is Aneto, in Spain, at 3,404 metres. Other notable summits include Vignemale and Monte Perdido. The range contains glaciers, alpine lakes, deep valleys, and distinctive plant and animal communities, although its glaciers have declined substantially.
The mountain boundary is not an absolute cultural divide: people, languages, and trade have crossed the Pyrenees for centuries. The Treaty of the Pyrenees, signed in 1659, helped establish a major part of the modern France–Spain frontier. The range is different from the Alps, which lie farther east and arc through several central European countries.