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The flag of Aargau was adopted in 1803 by Samuel Ringier-Seelmatter. The flag is divided into two parts: The left side is black with a central wavy band. This symbolises the fertile grounds of Aargau, through which flows the Aare, the Reuss, and the Limmat. The right side is light blue with three five-pointed stars. This symbolizes the three major regions that make up the Canton: County of Baden, Fricktal and The Free Bailies.

Source: Wikipedia