Lakes and rivers

Lakes

There are 26 natural lakes and small lakelets, which were formed      during a post-glacial period in the Park. Their total area is 1484.2 ha.  Three largest lakes, Lake Plateliai, lake Ilgis and Beržoras lake, occupy  approximately 90% of the total area. The bottom relief of these lakes is  complex, and there are islands on all of them (Lake Plateliai has 7  islands, lake Ilgis has 2 ones and Beržoras lake has 1 island). The most  picturesque, the cleanest and deepest lake in the Park and in Žemaitija  region is Lake Plateliai. Its area is 1205 ha, the average depth –10.5 m,  the deepest point - 50 m, the average water level –146.5 m above sea  level.

There are lots of small lakes in the territory of the Park, 23 of  them have the area less than 5 ha each; and another 10 natural water  reseroirs have the area less than 1 ha each.

The lakes of Burgis and Luoka have vegetation of Chara spp. The lakes of Burgis, Burgalis and Skyplaičiai have lots of benthic vegetation of Chara spp. Acoording to the EU Directive on vegitations the above lakes may be defined as a hard oligo-mesotrophic waters with the benthic vegetation of the Chara spp.The lakes of Vaivadė (Petreikis), Burgis, Endriuškaičiai, especially their turfy bays are full of Magnopotamion and Hydrocharition. There are lots of natural nourishment in these lakes, they are natural eutrophic lakes with Magnopotamion or Hydrocharition-type vegetation. There are small lakes surrounded by marsh in the Park (Lestis, Piktežeris, Aklaežeris), thery are attributed to natural dystrophic lakes. There is almost no flora in them; the water is brown because of turf and humus accids.


Rivers

The biggest river of the National Park the Babrungas has its source from the lake of Plateliai; its length is 47,3 km, 10 km of them run through the territory of the Park. Though, the Uošna river is considered to be the longest on the territory of the Park (13,3 km of 16,6 km lay across the Park). Besides the mentioned rivers there are 32 rivulets , 17 of them of it run only across the territory of the Park. The total length of these rivultes is 103,5 km, approximately 30 rivulets have their source in the Park. The largest part of the rivers and rivulets of the National park (51%) have been reclaimed and straightened.

There are quite a few springs in the territory of the Park, some of them even have sacral meaning. Springs of Plokščiai (3,2 ha) and Pilelis (2,4 ha) are natural monuments. Visitors can easily reach the springs of St.John and Pilelis.