Flag of Vidreres, Girona SPAIN.

Black flag with a yellow cross as wide as half the flag's height, charged with a black cross as wide as 1/6 of the flag's height, the whole charged with a yellow square as wide as 2/3 of the flag's height, bearing a black castle with yellow gate and windows, as high as half the flag's height. (Source: http://flagspot.net/flags/es-gi-vd.html)
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Xavigivax