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'Chikoy' () is a river in Chita Oblast and the Buryat Republic in Russia, which partially flows along the Russo-Mongolian border. It is a right tributary of the Selenga River. The length of the Chikoy is . The area of its basin is . The river freezes up in late October – November and stays icebound until April – early May. Its biggest tributary is the Menza River.