Yamagata (Japan)

White stylized three mountains on blue field because Yamagata means a shape of mountain. These also represents stream of the Mogami river running through Yamagata. Blue stands for desire for peace and ideal, white for snow and purity of people. Adopted 1963-03-26.
Nozomi Kariyasu, 6 May 1998

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Easy to describe as three mountain peaks in snow-white against the green of the forests. But if you look closely, you will see each peak has a triangular indentation which might be viewed as an opening>entrance>mouth. "Yama' is Japanese for mountain.
Bruce Ward, 7 June 1996

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the construction sheet of the Yamagata Prefecture is at www.pref.yamagata.jp. The flag is light blue according to the law, but not sure if the three measures in the law are Munsell or not.
Zachary Harden, 9 September 2009

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The colour specification in the law is JIS Z-8721, which as far as I know is indexed by Munsell notation. The fact that the three attributes are described as hue, brightness and chroma would seem to back that up, giving the colour as Munsell 2.5PB 2.8/8.73.
Jonathan Dixon, 9 September 2009