范文同
According to Chinese sources, the concept was invented in 1972 by the Bureau of Survey and Cartography of Vietnam under the Office of Premier Phạm Văn Đồng which printed out "The World Atlas" and said "The chain of islands from the Nansha and Xisha Islands to Hainan Island, Taiwan Island, the Penghu Islands and the Zhoushan Islands are shaped like a bow and constitute a Great Wall defending the China mainland."