Toyma River

Toyma, Tuyma River
Origin	Udmurtia
Mouth	Kuybyshev Reservoir, Kama River, near Yelabuga, Tatarstan
Basin countries	Tatarstan and Udmurtia, Russia
Length	124 km (77 mi)
Mouth elevation	53 m (174 ft)
Basin area	1,446 km2 (558 sq mi)

The Toyma (Russian: Тойма; Tatar: Cyrillic Туйма, Latin Tuyma) is a river in Udmurtia and Tatarstan, Russian Federation, a right-bank tributary of the Kama River. It is 124 kilometres (77 mi) long, of which 84 kilometres (52 mi) are in Tatarstan, and its drainage basin covers 1,446 square kilometres (558 sq mi). It begins in Udmurtia and falls to the Kama near Yelabuga, Tatarstan.

Major tributaries are the Vozzhayka, Yurashka, Karinka rivers. The maximal mineralization 400-600 mg/l. The maximal water discharge was 533 cubic metres per second (18,800 cu ft/s) in 1979. Drainage is regulated. Average sediment accumulation at the mouth per year is 146 millimetres (5.7 in). Since 1978 it is protected as a natural monument of Tatarstan. Mendeleyevsk and Yelabuga are along the river.