Tatula is a river of Biržai district municipality, Panevėžys County, northern Lithuania. It flows for and has a basin area of .
It is a right tributary of the Mūša.LIETUVOS RESPUBLIKOS UPIŲ IR TVENKINIŲ KLASIFIKATORIUS (Republic of Lithuania- River and Pond Classifications) . Ministry of Environment (Lithuania). Accessed 2011-11-11.
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