ハイズオン
"Hải Dương" is Sino-Vietnamese for "ocean sun" (海陽). The name first appeared officially in 1498. In feudal times, Hải Dương indicated a vast area from east of Hanoi to the South China Sea. The area corresponded to all of modern Hải Dương, Hải Phòng, most of Hưng Yên and the southwestern corner of Quảng Ninh.