Ladakalnis is a hill in Aukstaitijos national park, Lithuania.
Aukštaitija National Park is a national park in north-eastern Lithuania, about 100 km north of Vilnius. Established in 1974, it is the oldest of the five national parks in Lithuania. At first it was named Lithuanian SSR National Park to emphasize that it was the first such park in the republic. In 1991 four other parks were established and were named after ethnographic regions of Lithuania. The park was renamed after Aukštaitija.
The park covers 405.7 km². Ignalina district municipality controls about 50% of the area. Utena and Švenčionys district municipalities control 25%. Strictly protected areas occupy 2.1%. One can enter this territory only accompanied by a park employee. More than 70 percent of its area is covered by woods. 80 percent of woods are pine stands, some reaching 200 years old.
Sixty-four species of plant, eight species of fungus and 48 species of bird found in the park are included in Lithuania's Red book. The park is famous for its biodiversity: 59% of all plant species in Lithuania can be found in the park, which covers less than 1% of Lithuania.
One hundred and twenty-six lakes are scattered among the woods and hills. Many are interconnected by rivulets and streams and are popular for kayaking. Since the park was established more than 30 years ago, the infrastructure for water tourism had been well developed. There are a lot of sites where boats and kayaks can be hired and for overnight stays. The lakes cover 59.30 km² (or 15.5%) of the park. The largest of the lakes is Lake Kretuonas (8.29 km²). Lake Tauragnas, the deepest in Lithuania (60.5 m), is also here. There are 14 lakes bigger than 1 km². Six lakes are between 0.5 and 1 km² and 35 lakes between 5 and 50 ha. The rest are smaller than 5 ha and some are gradually turning into swamps.
Lake Baluošas contains seven islands, one of which has a small lake of its own. A small stream flows from this lake to Baluošas, which makes it unique in Lithuania. The longest river is Žeimena (22 km in the park, up to 114 km in total). It is very clean and flows into Neris. All lakes and rivulets belong to the Žeimena basin.
One of the most famous sights in the Park is Ladakalnis hill, from the top of which six lakes can be seen. It is a geomorphological monument.