After the High Tatras, the massif of the Low Tatras is the most significant geographical and highly stable ecological unit in Slovakia. The Low Tatras mountain range extends for 80 km from west to east between the picturesque valleys of the Váh and Hron rivers. Three peaks of the main ridge exceed the height of 2,000 m. The highest peaks such as Ďumbier (2,043 m), Chopok (2,024 m), Dereše (2004 m) and Kráľova hoľa (1948 m) provide a great view of the Slovak mountains and valleys. The Low Tatras are the second most visited mountains in Slovakia (after the High Tatras). In the last years, a number of new hotels, camping sites, chairlifts, ski lifts and tourist resorts have been built here. Nevertheless, there are still real primeval forests with a lot of animals, including bears, chiefly in the eastern part between the Čertovica saddle and Kráľova hoľa. Demänovská dolina, which lies in the northern part, is the most famous valley in the Low Tatras. It is particularly known as a centre of tourism, skiing and hiking and offers its guests everything necessary for a perfect holiday. In 1978, the area of the Low Tatras covering 81,095 hectares was declared a national park (NAPANT). The Low Tatras National Park and its protection zone have more than 840 km of marked hiking routes and 15 educational trails. The Low Tatras also provide opportunities for swimming (Bešeňová, Krpáčovo, Liptovská Mara, Liptovský Ján, Aquapark Tatralandia and Tále).