| Kubnya | |
| Mouth Coordinates: | 55.5344°N 48.4286°W |
| Subdivision Type1: | Country |
| Length: | 176km (109miles) |
| Basin Size: | 2480km2 |
The Kubnya (Russian: Кубня; Chuvash: Кĕтне, Kĕtne; Tatar: Гөбенә) is a river in Chuvashia and Tatarstan, Russian Federation, a left-bank tributary of the Sviyaga. It is 176km (109miles) long, of which 121km (75miles) are in Tatarstan, and its drainage basin covers 2480km2.[1] It begins in Chuvashia and flows to the Sviyaga 4km (02miles) south of Burunduki.
A major tributary is the Uryum. The maximal mineralization is 500-800 mg/L. The average sediment deposition at the river mouth per year is 92mm. The maximal water discharge is 420m3/s. Drainage is regulated. Since 1978 it is protected as a natural monument of Tatarstan.