Flag of  Diamantino, Mato Grosso, Brazil.
<a href="//commons.wikimedia.org/wiki/User:Wikimandia" class="mw-redirect" title="User:Wikimandia">Wikimandia</a>
2017-10-23
Own work based on: <a rel="nofollow" class="external text" href="http://www.diamantino.mt.gov.br/O-Municipio/Hino-Bandeira-Brasao/">source</a>