Vilnia

The Vilnia (also Vilnelė; Вільня, Vilnia ; Wilejka, Wilenka) is a river in Belarus and Lithuania. Its source is near the villages of Kiemėnai and Vindžiūnai, 6 km south of Šumskas, nearby to the A3–M7 Medininkai–Kamenny Log border crossing complexes of the Belarus–Lithuania border.

Geography
The Vilnia is 79.6 km long and its basin covers 624 sq. km. The river's steepness is 124.6 metres from the source to the mouth. For 13 km, its flow marks the Belarus-Lithuania border, and the remaining 69 km are in Lithuania where it flows into the Neris River at Vilnius. Eventually, its waters, via the Neris draining into the Neman River, reach the Baltic Sea. Its confluence with the Neris lies within the city of Vilnius, and the river's name is regarded to have been the source of the city's name.

Naming
The name of the river derives from the Lithuanian language word vilnis ("a surge") or vilnyti ("to surge"). Beneath it stands the Indo-European root wel-/wl- meaning "to roll", "to spin". Vilnelė, the diminutive form of the original hydronym Vilnia, came into popular use in Lithuanian and in Soviet times largely replaced the latter because of Polish language influence — Poles translated Lithuanian name of the river with such diminutive form (Wilenka).

Fauna
Within the river basin, approximately 30 living species of fish and birds have protected status. In an effort to restore the upstream migration of salmonids in the basin, a fish ladder was constructed on the Vilnia in 2000.