The source of the Plyussa is in Lake Zapluysskoye in the eastern part of Plyussky District.

In Gdovsky District, it gradually turns north and enters Leningrad Oblast.

[2] 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.

[1] Media related to Plyussa River at Wikimedia Commons