Flag of the municipality of Härjedalen, Sweden; and also the flag of the province of Härjedalen
<a href="//commons.wikimedia.org/wiki/User:Fornax" title="User:Fornax">Fornax</a>
CC BY 3.0
<p>Source for the design: <a rel="nofollow" class="external text" href="https://riksarkivet.se/heraldik-register-vapen?HeraldikID=30">(Province)</a>, <a rel="nofollow" class="external text" href="https://riksarkivet.se/heraldik-register-vapen?HeraldikID=126">(Municipality)</a><br></p>
Source for officially sanctioned flags being banners of arms: <a rel="nofollow" class="external text" href="https://riksarkivet.se/flaggning-med-andra-an-nationsflaggor">(Provinces)</a>, <a rel="nofollow" class="external text" href="https://riksarkivet.se/vagledning-om-kommunvapen">(Municipalities)</a>