The flag of Brittany is called the Gwenn-ha-du which means white and black.

Some Bretons say that it is the only flag in the world which does not have any colours, which is wrong (see Fribourg, Ceuta, Cornwall, etc.), but surely it is the only flag in the world which in a parade is carried at arm's length over head.

The dimensions are not really fixed. They vary from 9:14 cm to 8:12 m. The flag is not only used by cultural associations or autonomists but really by everybody, and this quite often: you can even see it on town halls in the region. Because of the absence of legislation concerning regional flags in France the flag is also flown on sail and fishing boats. This is tolerated, but the French flag must also be flown. The design of the ermine spots can vary but the most frequently seen is that on the above drawings.

Over the years, the authorities considered the flag as separatist but things have now changed and the flag can appear everywhere, even on public buildings along with the French flag. It no longer has any political connotations. The Gwenn-ha-du is now the flag of the région Bretagne. It is also used in the département of Loire-Atlantique, although this belongs to the région Pays de la Loire, because the territory of Loire-Atlantique is historically part of the province of Brittany. Nantes (Naoned), its préfecture, was once one of the two capital cities of Brittany.