The Nercha (Russian: Нерча, Buryat: Нэршүү, Nershüü; Mongolian: Нэрчүү, Nerchüü) is a river in Zabaykalsky Krai in Russia, left tributary of the Shilka[1] (Amur's basin).

The area of its basin is 27,500 square kilometres (10,600 sq mi).

[2] The Nercha freezes up in October and stays icebound until late April – early May.

The town of Nerchinsk is located on the Nercha,[a] 7 kilometres (4 mi) from its confluence with the Shilka.

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