Piusa River
Piusa is a river in Southeastern Estonia
Estonia , officially the Republic of Estonia , is a state in the Baltic region of Northern Europe. It is bordered to the north by the Gulf of Finland, to the west by the Baltic Sea, to the south by Latvia , and to the east by Lake Peipsi and the Russian Federation . Across the Baltic Sea lies...

 and, for the last 14 km before draining into Lake Pihkva, in Pskov Oblast
Pskov Oblast
Pskov Oblast is a federal subject of Russia . Pskov Oblast borders the countries of Estonia and Latvia, as well as Belarus. It is the westernmost federal subject of contiguous Russia . Its major cities are the administrative center Pskov and Velikiye Luki . Area: 55,300 km²...

, Russia
Russia or , officially known as both Russia and the Russian Federation , is a country in northern Eurasia. It is a federal semi-presidential republic, comprising 83 federal subjects...

. For a 17-km-long section near Pechory
Pechory : Petseri; ) is a town and the administrative center of Pechorsky District of Pskov Oblast, Russia. Population: The population includes a few hundred ethnic Estonians.The town is famous for the Russian Orthodox Pskovo-Pechersky Monastery....

 Piusa is the border river between Estonia and the Russian Federation.

Piusa has the greatest drop of all Estonian rivers (214 meters).
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