The river Salcia flows in Belarus and Lithuania (Salcininkai and Varena districts, the river Merkys left tributary. Length of the river 76 km, the basin area 763 km ². The source 4 km north from Salcininkai town; the first 4 flows in Lithuania through Salcininkai town; turns to west and 11 km flows Lithuania - Belarus border and in Belarus; flows in Lithuania again, at southern border of forest Rudininku giria. Flows into the river Merkys 88 km from its mouth at Valkininai village. Average gradient 92 cm/km. Average rated discharge upstream the mouth of the brook Berzuna 0.28 m³/s, upstream the mouth of the brook Visincia 2.93 m³/s, at the mouth 5.72 m³/s.

Aall year.
Fallen trees
WW 0 (1-).

44.9 Vilnius - Butrimoniai road bridge. Under the bridge small rapid. left Gerviskes. The river flows through forests, meadows. The current calm. The river bed very curvy. Average rated discharge approx. 1.5 m³/s.
43.3 right Berze. Average gradient to the river Salcykscia 77 cm/km. Rated discharge increases. The riverbed average width to the river Visincia 8 m.
42.7 Bridge. right Rudnia.
38.9 left Salcykscia. Average gradient to the river Visincia 56 cm/km. Rated discharge increases.
38.4 right the brook S-2. right Kalitonys.
36.5 Bridge.
35.0 left the brook S-1. left Ciuronys.
31.6 left Papiskes.
28.2 right hillfort Tetervinai. left Tetervinai.
25.8 right Visincia. Average gradient to the brook Maltupis 49 cm/km. Rated discharge is almost doubled. The current a bit faster.
20.5 left Maltupis. left Nevainionys. Average gradient to the brook Brasta 52 cm/km.
16.3 left Ciras.
12.9 Vilnius - Eisiskes road bridge. right Zygimantiskes.
11.0 left Pabalde.
8.0 left Brasta. left Kursiai. Average gradient to the mouth 79 cm/km. The current a bit faster.
3.5 left Pasalciai.
2.0 Valkininkai - Eišiškes bridge. right Uzperkasis.
0.0 The Salcia flows into the river Merkys.