Nereta () is a river of Biržai district municipality, Panevėžys County, northern Lithuania and Southern Latvia. It flows for . For , the river forms the border between Latvia and Lithuania. It is a right tributary of the Nemunėlis.LIETUVOS RESPUBLIKOS UPIŲ IR TVENKINIŲ KLASIFIKATORIUS (Republic of Lithuania- River and Pond Classifications) . Ministry of Environment (Lithuania). Accessed 2011-11-14.
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