Kawaguchi [Saitama prefecture Japan]

Kawaguchi city in Saitama adopted its flag on July 16 1965.

proportion: 2:3
field: Japanese light yellow
emblem: 7/10 of width Japanese dark bluish green
The emblem is a stylized kanji Kawa and Guchi.

Source: Kawaguchi website
Nozomi Kariyasu, 22 November 2005

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Adopted by Notice No. 49. The emblem was adopted on 18 September 1933, Notice No 70. Although I didn't find this written anywhere, as Nozomi says, the emblem has a stylised kanji kawa 川 (river), forming a circle around a stylised kanji guchi 口 (mouth, entrance).
Jonathan Dixon, 4 January 2006