Vyshnia or Wisznia () is a right tributary of the San River in southeastern Poland and western Ukraine.
Description It flows for , of which flows through Ukraine. Just south of Rudky, Ukraine, near the village of Novosilky-Hostynni, the river reverses flow, with the southern extremity flowing into the Dniester.
The river falls into San near the city of Radymno.
Tributaries Left Vyshenka Sichnia Troshchanka (left) Shum (left) Sikonytsia (right) Chyzhivka (left)
Right Rakiv Zamlynka (left) Hlynets (right) Khorosnytsia Huchok (right) Chornyi Potik (Black Stream)
See also Rivers of Poland Walddeutsche