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Hwanghae (Hwanghae-do) was one of the Eight Provinces of Korea during the Joseon Dynasty, and one of the thirteen provinces of Korea during the Japanese Colonial Period. Hwanghae was located in the northwest of Korea. The provincial capital was Haeju.

In 1395, the province was organized as P'unghae (P'unghae-do; 풍해도; 豊海道). In 1417, the province was renamed Hwanghae. The name derived from the names of the two principal cities of Hwangju (황주; 黃州) and Haeju (해주; 海州).

In 1895, the province was reorganized into the Districts of Haeju (Haeju-bu; 해주부; 海州府) in the west and Gaeseong (Gaeseong-bu; 개성부; 開城府) in the east, but in 1896, a new system of thirteen provinces was established, and Hwanghae Province was reconstituted.

In 1945, Korea was divided into Soviet and American zones of occupation, north and south respectively of the 38th parallel. The southernmost part of Hwanghae (around the towns of Ongjin and Yŏnan) was cut off from the rest of the province by the dividing line, and joined Gyeonggi Province in the southern half of the country. In 1948, Hwanghae and Gyeonggi Provinces became parts of the new countries of North and South Korea respectively.

In 1953, at the end of the Korean War, the Northern Limit Line was established, which marked the maritime boundary between North and South Korea. The line runs between the mainland portion of Gyeonggi Province that had been part of Hwanghae before 1945, and the adjacent offshore islands (the largest of which is Baengnyeongdo). As a result, the mainland portion reverted to North Korean control, while the islands remained a part of South Korea. (Since 1999, North Korea has claimed a more southerly Maritime Military Demarcation Line, which would make the islands a part of North Korea as well. Disputes between North and South Korean naval vessels often occur in this area.)

In 1954, North Korea's Hwanghae Province was divided into North and South Hwanghae.

Hwanghae was bounded by P'yŏngan (after 1896 South P'yŏngan) on the north, Kangwŏn on the east, Gyeonggi on the south, and the Yellow Sea on the west.

The regional name for the province was Haesŏ.

• Seoul City history article on Hanseong and 22 other late 19th-century districts (in Korean)