Songacha or Sungacha is border river between Russian Federation and People's Republic of China, a tributary of Ussuri River. It is only outflow of the Khanka Lake.
It is from 180 km to 210 km in length , the area of its basin is approximately 25,600 km?.
Flora and fauna of Songacha are very rich. There is of Far East ''Nelumbo nucifera'' in river's basin.
Its Songacha's waters come from rain, snow and .
The fairway of Songacha River is border between Russian Federation and People's Republic of China.