Bionaz (French pronunciation:[bjɔna]; Valdôtain: Bioun-a; Biona from 1939 to 1946) is a comune sparso[3] which extends over 143 square kilometres (55 sq mi) of the North-Eastern Valpelline area of the Aosta Valleyregion of northwest Italy. The commune lies on the left side of the river Dora Baltea. The population of about 240 is dispersed among 20 or more small alpine villages and hamlets including Plan-de-Veyne, which is the main centre and the capoluogo (locally and officially also chef-lieu, in French). The commune belongs to the Unité des communes valdôtaines du Grand-Combin.
^The expression comune sparso means a comune whose administrative centre is located in a hamlet whose name does not coincide with the name of the comune itself.
