The Krka National Park is justly celebrated for the beauty and variety of its scenery. The Krka River, with seven picturesque waterfalls, runs through the park. Ten species of fish native to the area have been discovered in the river. The park is an important ‘stop’ on the route taken by many migratory birds every spring and autumn. This makes it one of the most ornithologically imported areas in Europe (ornithology is the branch of zoology that deals with birds). The park contains the remains of many heritage sites from different ages: an ancient water supply system, a military camp called Burnum, medieval old Croatian fortifications from the 14th century. Also noteworthy are several religious sites on its territory: a Franciscan monastery, the Church of Our Lady of Mercy, and the St. Archangel Monastery.