The Bula is a river in Chuvashia and Tatarstan

Tatarstan

The Republic of Tatarstan is a federal subject of Russia located in the Volga Federal District. Its capital is the city of Kazan, which is one of Russia's largest and most prosperous cities. The republic borders with Kirov, Ulyanovsk, Samara, and Orenburg Oblasts, and with the Mari El, Udmurt,...

, Russian Federation

Russia

Russia or , officially known as both Russia and the Russian Federation , is a country in northern Eurasia. It is a federal semi-presidential republic, comprising 83 federal subjects...

, a left-bank tributary

Tributary

A tributary or affluent is a stream or river that flows into a main stem river or a lake. A tributary does not flow directly into a sea or ocean...

 of the Sviyaga River

Sviyaga River

The Sviyaga is a river in the Ulyanovsk Oblast and Tatarstan, a right tributary of the Volga River. It has a length of 375 km. The area of the basin is 16,700 km². The Sviyaga River flows into the Sviyaga Cove of the Kuybyshev Reservoir, west of Kazan. It freezes up in November-December and stays...

. Its length is 118 km and its drainage basin

Drainage basin

A drainage basin is an extent or an area of land where surface water from rain and melting snow or ice converges to a single point, usually the exit of the basin, where the waters join another waterbody, such as a river, lake, reservoir, estuary, wetland, sea, or ocean...

 is 1,587 km². It origins in Chuvashia and falls to the Sviyaga River

Sviyaga River

The Sviyaga is a river in the Ulyanovsk Oblast and Tatarstan, a right tributary of the Volga River. It has a length of 375 km. The area of the basin is 16,700 km². The Sviyaga River flows into the Sviyaga Cove of the Kuybyshev Reservoir, west of Kazan. It freezes up in November-December and stays...

 south of Devlikeyevo.
Major tributaries are Cheremshan, Little Bula Rivers. The maximal mineralization 700–1000 mg/l. Batyrevo, a district center in Chuvashia, stays on the river.