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The flag of Ontario is a defaced Red Ensign, with the Royal Union Flag in the canton and the Ontario shield of arms in the fly. The flag of Ontario was derived from the Canadian Red Ensign that was used as a civil ensign and the flag of Canada from the late 19th century to 1965. When the new Canadian Flag replaced the old in 1965, Ontario changed the Canadian arms on the former national flag to the Ontario arms. May 21 is Ontario Flag Day.
The coat of arms of Ontario is the armorial emblem representing the Canadian province of Ontario. The arms contain symbols reflecting Ontario's British heritage, along with local symbols. At the upper part of the shield is the red cross of St. George, representing England. The lower portion of the shield features three golden maple leaves on a green background.