Werder is a town in the state of Brandenburg, Germany, located on the Havel river in the Potsdam-Mittelmark district, west of the state's capi…Werder is a town in the state of Brandenburg, Germany, located on the Havel river in the Potsdam-Mittelmark district, west of the state's capital Potsdam. Werder has a long and rich history and is a nationally recognized Erholungsort – a government designation given to regions of Germany that have been recognized and must be continuously re-certified as having air and climate qualities which provide a healthful environment to visitors. Werder is also famous for hosting a Cherry Blossom Festival, the Baumblütenfest, every May.