The Flag of Seine-Maritime, France, is a rectangular banner that represents the historical region in the northwest part of the country. It consists of three vertical stripes, arranged from left to right, in the colors green, white, and red. Green occupies about two-thirds of the flag’s hoist side, while the remaining one-third on the fly side is divided equally between white and red.This design originates from the arms of the former Duchy of Normandy, which included Seine-Maritime among its territories. The use of these colors has a historical significance, as they are also found in the flags of other Normandy departments.The exact date of the first official usage is not clearly documented; however, it can be traced back to at least the 19th century when various French regions started adopting their own regional flags. Today, the Flag of Seine-Maritime continues to serve as a symbol of regional pride and identity within France.