Why it belongs here
The Bula (Russian: Була; Chuvash: Пăла, Păla; Tatar: Бола) is a river in the Chuvash Republic and the Republic of Tatarstan, Russia, a left-bank tributary of the Sviyaga. Its length is 118 kilometres (73 mi) and its drainage basin is 1,580 square kilometres (610 mi2).
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