'Flag of Yokohama Kanagawa Japan' The Flag of Yokohama, a city in the Kanagawa Prefecture of Japan, is a significant emblem representing its unique identity. The flag features three horizontal stripes, with the central one being white and twice as wide as the other two. The outer stripes are blue, symbolizing the sea and the sky. This design was officially adopted in 1934. It's essential to note that while Yokohama has its own flag, Japan does not have subnational flags for its cities or prefectures in the traditional sense; the Flag of Yokohama is a local symbol rather than a recognized national one.