Aigüestortes i Estany de Sant Maurici National Park is a protected area located in the Pyrenees Mountains in the Catalonia region of Spain. The park was established in 1955 and covers an area of over 40,000 hectares, making it the second-largest national park in Catalonia.

The landscape of the park is characterized by high peaks, deep valleys, and numerous glacial lakes, including the Estany de Sant Maurici, the largest lake in the park. The park is also home to several rivers, including the Noguera Pallaresa and the Noguera Ribagorçana, which flow through deep gorges and canyons.

The park is known for its diverse flora and fauna. It is home to several species of mammals, including chamois, marmots, and otters, as well as a variety of bird species such as the golden eagle, the griffon vulture, and the black woodpecker. The park is also home to numerous species of amphibians and reptiles.

Aigüestortes i Estany de Sant Maurici National Park is a popular destination for outdoor activities such as hiking, mountain biking, and rock climbing. The park has a network of hiking trails that range from easy strolls to challenging multi-day treks, and many of the trails provide stunning views of the park's rugged peaks and beautiful lakes.