Tancua is a village in the department of Jura in the region of Bourgogne-Franche-Comté, France. Formerly a separate municipality, it was merged with Morbier on 1 January 2007.Arrêté du 10 octobre 2006 portant modification aux circonscriptions administratives territoriales (fusion de communes), Légifrance. Its inhabitants are known as Quewans.
Tancua was, until well into the 20th century, mainly agricultural, especially for livestock breeding and dairy farming, with somewhat of a logging industry.
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