Piusa (river)

The Piusa ( "Piuza" or "Pimzha") is a river in Southeastern Estonia and, for the last 14 km before draining into Lake Pihkva, in Pskov Oblast, Russia. For a 17-km-long section near Pechory Piusa is the border river between Estonia and the Russian Federation.
The Piusa has the greatest drop of all Estonian rivers (214 metres).