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The flag of Kaluga Oblast consists of three horizontal stripes: the upper one being red, the middle white, and the lower green. The white stripe is the smallest of the three, occupying 1/6th the total height of the flag, with the other two stripes being of equal height to each other and making up the remaining 5/6ths. Within the center of the red stripe is a golden imperial crown. The ratio of the flag is 2:3. It was adopted on 30 January 2004.

Source: Wikipedia