Plyussa River

Plyussa
The Plyussa in the town of Slantsy.
Country	Russia
Basin features
Main source	Lake Zapluysskoye 64 m (210 ft) 58°24′57.1″N 29°42′17.9″E / 58.415861°N 29.704972°E / 58.415861; 29.704972
River mouth	Narva River at Narva Reservoir 59°14′58″N 28°9′15″E / 59.24944°N 28.15417°E / 59.24944; 28.15417Coordinates: 59°14′58″N 28°9′15″E / 59.24944°N 28.15417°E / 59.24944; 28.15417
Basin size	6,550 km2 (2,530 sq mi)
Tributaries	Left: Omuga, Kureya, Chernaya, Lyuta Right: Paguba, Verduga, Yanya, Ruya
Physical characteristics
Length	281 kilometres (175 mi)
Discharge	Average rate: 50 m3/s (1,800 cu ft/s) (near Slantsy)

The Plyussa (Russian: Плюсса) is a river in Plyussky and Gdovsky Districts of Pskov Oblast and in Slantsevsky District of Leningrad Oblast in Russia. It is a right tributary of the Narva River. It is 281 kilometres (175 mi) long, and the area of its basin 6,550 square kilometres (2,530 sq mi). The urban-type settlement of Plyussa and the town of Slantsy are located on the banks of the Plyussa.

The source of the Plyussa is in Lake Zapluysskoye in the eastern part of Plyussky District. The river flows south and turns northwest. In Gdovsky District, it gradually turns north and enters Leningrad Oblast. Below the town of Slantsy, the natural course of the Plyussa is made a water reservoir, a bay of the Narva Reservoir. The mouth of the Plyussa is in the southern bay of the Narva Reservoir.

The river gave its name to the Treaty of Plussa, concluded at its banks. The treaty ended the Livonian War between Sweden and Russia in 1583.

Until the 1990s, the river was used for timber rafting.