Bezdna (Chuvashia)

The Bezdna (Бездна) or Pasna (Пасна) is a river in Chuvashia, Russian Federation, a right-bank tributary of the Sura. It is 106 km long, and has a drainage basin of 1320 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.