Bezdna (Chuvashia) should not be confused with Bezdna River, Tatarstan.
| Bezdna, Pasna | |
| Source1 Location: | Shemurshinsky District |
| Mouth: | Sura |
| Mouth Location: | Alatyr, Alatyrsky District |
| Mouth Coordinates: | 54.8286°N 46.6219°W |
| Subdivision Type1: | Country |
| Subdivision Name1: | Chuvashia, Russia |
| Length: | 106km (66miles) |
| Basin Size: | 1320km2 |
The Bezdna (Russian: Бездна) or Pasna (Chuvash: Пасна) is a river in Chuvashia, Russian Federation, a right-bank tributary of the Sura. It is long, and has a drainage basin of .[1]
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.