In Vietnam, the Hmong people are one of the largest ethnic minorities (around 900,000 people). They are principally concentrated in the mountainous north of the country and usually live at high altitudes. Different ethnic categories co-exist and can easily be identified by the way they dress and their traditions. The Black Hmongs are best known for their handicraft and their traditional indigo blue dress. Flower Hmongs, on the other hand, wear colorful clothes, and it is not difficult to find them during market days.