| Shemurshinsky District|
| 1,320 km (510 sq mi)|
Alatyr, Chuvash Republic
| Alatyr, Alatyrsky District|Bezdna River, Chuvashia Wikipedia
The Bezdna (Russian: Бездна) or Pasna (Chuvash: Пасна) is a river in Chuvashia, Russian Federation, a right-bank tributary of the Sura River. Its length is 97.7 km and its drainage basin is 1,320 km².
Major tributaries are Abamza, Orbezdna, Black Bezdna. The maximal mineralization 500-700 mg/l. Average sediment in mouth per year is 71 mm. Drainage is regulated. In the upper stream use to dry.