| Piusa | |
|---|---|
 The Härma rock face on the Piusa | |
 | |
| Location | |
| Countries | |
| Physical characteristics | |
| Source | |
| • location | Plaani Külajärv |
| • elevation | 244 m (801 ft) |
| Mouth | Lake Peipus (Pihkva) |
• coordinates | 57°58′02″N 27°48′57″E / 57.96722°N 27.81583°E |
• elevation | 30 m (98 ft) |
| Length | 109 km (68 mi) |
Basin size | 796 km2 (307 sq mi) |
| Discharge | |
| • average | 5.5–6.0 m3/s (190–210 cu ft/s) |
| Basin features | |
| Progression | Lake Peipus→ Narva→ Gulf of Finland |
| Tributaries | |
| • right | Pelska |
The Piusa (Russian: Пиуза Piuza or 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.
The Piusa has the greatest drop of all Estonian rivers (214 metres) and in the past there were 39 watermills on the river.
