BUFF® Epic Trail Aigüestortes: 65km-long race, featuring 5600 m ascents around Aigüestortes National Park. Aigüestortes and Lake Sant Maurici National Park is one of the fourteen national parks in the Spanish State, and the only one within Catalonia. Located in the heart of the Pyrenees, it constitutes -together with the parks of Ordesa and Monte Perdido and the one in the French Pyrenees- an excellent sample of the main ecosystems that we can discover in the Catalan high mountain areas. Peaks of more than three thousand meters height; rivers, ravines, waterfalls and marshes which make us truly feel in the land of water; more than 200 mountain lakes varying in shape and color; and a great diversity of animal and vegetal species that struggle to survive in a harsh environment, all of which give life to this protected natural space, unique in the South of Europe.