Bula (river)
The Bula (; ; ) is a river in the Chuvash Republic and the Republic of Tatarstan, Russia, a left-bank tributary of the Sviyaga. Its length is and its drainage basin is . It originates in the Chuvash Republic and falls into the Sviyaga River south of Devlikeyevo. Major tributaries are the Cheremshan and the Malaya Bula. The maximum mineralization is 700–1000 mg/l. Batyrevo, the administrative center of Batyrevsky District of the Chuvash Republic, is located on the river.