Landscape and biological diversity. Sirveta Regional Park represents the distinctive structure created by morainic accumulation and glacio-fluvial erosional processes, an important part of the Žeimena and Dysna watershed ecosystem – the southern hilly complex of the orographic stump of the Švenčionys upland and the highest in Švenčionys upland Nevaišiai hill field.

The landscape diversity of the regional park has been formed by the following major landscape types: forested and little cultivated steep-sloped lake-rich old valleys, little cultivated and cultivated morainic hill fields, forested ant little cultivated laky tunnel valleys, lake rich wetland waterholes, small springs valleys, erosional old valleys, erosional sloped and ethno-cultural settlements.

These are the territories of European Community importance (code, title) found in the park: 9020 Fennoscandian hemiboreal natural old broad-leaved deciduous forests (Quercus, Tilia, Acer, Fraxinus or Ulmus) rich in epiphytes, 7140 Transition mires and quaking bogs, 3140 Hard oligo-mesotrophic waters with benthic vegetation.

The total number of plant species is 257, of these 13 are included in Lithuania’s Red Data Book. The total number of animal species is 415. Mammals – 38, of these 2 are protected by the European Community, and 5 are included into the Lithuania’s Red Data Book. Birds –  161, of these 19 are protected by the European Community, and 28 are included into the Lithuania’s Red Data Book. Fishes – 14. Amphibians and reptiles – 15, of these 1 is protected by the European Community, and 2 are included into the Lithuania’s Red Data Book. Invertebrates – 187, of these 4 are protected by the European Community, and 7 are included into the Lithuania’s Red Data Book.

The following 8 reserves have been established in the Sirvėta Regional Park to protect its natural and cultural heritage values: 2 landscape, 2 geomorphological, I hydrographical, 1 telmological, 1 botanical, and 1 ethno-cultural).

The landscape reserves have been established to protect Sirvėta –  the distinctive steep-sloped tunnel valley with a complex interconnecting lake system of Bėlis, Sėtikis, Sirvėta, Staškinė, and Kančioginas, Lukšiškiai tunnel valley and Sėtikis remnant; the diversity of natural biotopes with Gladiolus imbricatus, Dactylorhiza maculate, Dactylorhiza baltica, habitats of Lutra lutra and Lepus timidus, unique calcareous lakeside marshes, frequent on the lakesides calcareous  exposures and Kančioginas town with the distinctive layout structures and valuable complexes of folk architecture; Šventa – the distinctive Šventa River tunnel valley, forests with mature spruce, black alder and wetland inserts, former Šventas manor site, Šventa barows, the old Kulniškė village of high architectural value, Ilgis Lake and the surrounding calcareous marshes with protected plant communities, the old villages of Aidukai, Aučyna, and Matukai, and the Aučynai mound.

The geomorphological reserves have been established to protect: Čiūlėnai – the protuberant Čiūlėnai ridge in the Švenčionys morainic upland – the distinctive watershed-type forested lake-rich morainic masiff; the Mergežeris Lake with benthic vegetation, calcareous marshes with rare Hammarbya paludosa populations; Lutra lutra habitats; Nevaišiai – the highest Švenčionys-Narutis upland masiff with the Nevaišiai hill.

The Ilgys Hydrographical Reserve has been established to protect the Možeris, Ilgys, Žiaurys, Vyštutis and Samanys Lakes’ system that has formed 200 metres above the sea level, and the Ilgys Lake’s calcerous fens with protected plant life.

The Salotis Telmological Reserve has been established to protect the Salotis Lake and the surrounds with lakeside wetlands, including the habitat of the European Community importance – the Transition mires and quaking bogs, and the diversity of biotopes with the habitats of Lutra lutra, Bombina bombina, Osmoderma eremita, Vertigo angustior.

The Neversčiai Botanical Reserve has been established to protect the natural Ash tree woods, including the Fennoscandian deciduous swamp woods habitat of the European Community importance.

The Didžiasalis Ethno-cultural Reserve has been established to protect the single-street village of forty two homesteads, its urban (layout, spatial, volumetric) structure, the authentic and traditional territory and individual plots’ development type, the authentic and traditional architectural expression of the buildings, and the natural environment.

There are 4 state protected natural heritage objects in the Sirvėta Regional Park, of these 1 is a nature monument. The most important ones are the following: Lino Verdenė Spring, Adamavas Oak, and the Linden Tree Arbour. There are 15 cultural heritage objects protected in the park, of which 4 are cultural monuments.

Museums and exhibitions. In the Visitors’ centre of the Sirvėta Regional Park, there is an exhibition displayed themed „Mythology”.

Traditional festivals, events and customs. Every year, the traditional Winter festivals and Shrovetide are celebrated. Echoing the past, the old Lithuanian songs called sutartinės that are included into the list of UNESCO non-material cultural heritage are still heard in this regional park. On the stage installed by the Bėlis Lake a traditional fold music and dance festival The Lake Pool („Ežerų Sietuva”) is organised – it is a unique possibility to learn about the cultures of different countries, and to admire the stunning scenery.

Summer camps are organised in the regional park where children can learn about their natural environment, go on night hikes and excursions to the park’s most interesting areas.

People living there have long been engaged in beekeeping, sheep breeding and traditional crafts. In many houses here, women still bake home-made bread, and the smell of mild and having specific flavour acorn coffee reminds of the great oak forests which used to grow here.

Older people still remember the method of making this delicious drink… In some of the villages, women weave fabrics, wind ribbons, and felt, while men engaged in decorative wood and stone carving, pottery, weaving, blacksmithing and cross-crafting, a branch of art included in the list of UNESCO non-material and oral heritage. Currently, there are around 40 crosses in the Sirvėta Regional Park. Some of them are old, and others are being renovated.