Piusa (river)

{{Short description|River in Estonia}}

{{Infobox river

| name = Piusa

| image = Härma mäemine müür.JPG

| image_caption = The Härma rock face on the Piusa

| source1_location = Plaani Külajärv

| mouth = Lake Peipus (Pihkva)

| mouth_location =

| mouth_coordinates = {{Coord|57|58|02|N|27|48|57|E|type:river|display=it}}

| progression = {{RLake Peipus}}

| subdivision_type1 = Countries

| subdivision_name1 = {{hlist|Estonia|Russia}}

| length_km = 109

| source1_elevation = {{convert|244|m|abbr=on}}

| mouth_elevation = {{convert|30|m|abbr=on}}

| discharge1_avg = {{convert|5.5|-|6.0|m3/s|cuft/s|abbr=on}}

| basin_size_km2 = 796

| tributaries_right = Pelska

}}

The Piusa ({{langx|ru|Пиуза}} Piuza or {{lang|ru|Пимжа}} 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 section near Pechory, the Piusa is the border river between Estonia and Russia.{{cite web |url=http://www.loodusajakiri.ee/eesti_loodus/artikkel419_415.html |title=Piusa on Setomaa Emajõgi |accessdate=2008-11-15 |work=Eesti Loodus|language=et}}

The Piusa has the greatest drop of all Estonian rivers (214 metres).{{cite web |url=http://www.setomaa.ee/index.php?id=3416a75f4cea9109507cacd8e2f2aefc&object_id=787 |title=Landscape Reserve of Primeval Valley of Piusa River |accessdate=2008-11-15 |url-status=dead |archiveurl=https://web.archive.org/web/20070902160859/http://www.setomaa.ee/index.php?id=3416a75f4cea9109507cacd8e2f2aefc&object_id=787 |archivedate=2007-09-02 }}