Revised Romanization of Korean in the context of "Ganghwa County"

The Yellow Sea (simplified Chinese: 黄海; traditional Chinese: 黃海; pinyin: Huáng Hǎi; Korean: 황해; Hanja: 黃海; RR: Hwanghae), also known as the North Sea, is a marginal sea of the Western Pacific Ocean located between mainland China and the Korean Peninsula, and can be considered the northwestern part of the East China Sea.

Jeju Island (Jeju and Korean: 제주도; Hanja: 濟州島; RR: Jejudo; pronounced [tɕeːdʑudo]) is South Korea's largest island, covering an area of 1,833.2 km (707.8 sq mi), which is 1.83% of the total area of the country. Alongside outlying islands, it is part of Jeju Province and makes up the majority of the province.

The island lies in the Korea Strait, 82.8 km (51.4 mi) south of the nearest point on the Korean Peninsula. The Jeju people are indigenous to the island, and it has been populated by modern humans since the early Neolithic period. The Jeju language is considered critically endangered by UNESCO. It is also one of the regions of Korea where Shamanism is most intact.

Gyeonggi Province (Korean: 경기도; RR: Gyeonggi-do, Korean pronunciation: [kjʌ̹ŋ.ɡi.do̞]) is the most populous province in South Korea.

Seoul, the nation's largest city and capital, is in the heart of the area but has been separately administered as a provincial-level special city since 1946. Incheon, the nation's third-largest city, is on the coast of the province and has been similarly administered as a provincial-level metropolitan city since 1981. The three jurisdictions are collectively referred to as Sudogwon and cover 11,730 km (4,530 sq mi), with a combined population of over 26 million - amounting to over half (50.25%) of the entire population of South Korea, and a third of the population of the Korean peninsula at the 2020 census.

Paekche or Baekje (Korean: 백제; Hanja: 百濟; RR: Baekje; MR: Paekche; pronounced [pɛk̚.tɕ͈e]) was a Korean kingdom located in southwestern Korea from 18 BCE to 660 CE. It was one of the Three Kingdoms of Korea, together with Goguryeo and Silla. While the three kingdoms were in separate existence, Baekje had the highest population of approximately 3,800,000 people (760,000 households), which was much larger than that of Silla (850,000 people) and similar to that of Goguryeo (3,500,000 people).

Baekje was founded by Onjo, the third son of Goguryeo's founder Jumong and Soseono, at Wiryeseong (present-day southern Seoul). Baekje, like Goguryeo, claimed to succeed Buyeo, a state established in present-day Manchuria around the time of Gojoseon's fall.

Empress dowager (also dowager empress or empress mother; Chinese and Japanese: 皇太后; pinyin: huángtàihòu; rōmaji: Kōtaigō; Korean: 황태후 (皇太后); romaja: Hwang Tae Hu; Vietnamese: Hoàng Thái Hậu (皇太后)) is the English language translation of the title given to the mother or widow of a monarch, especially in regards to Chinese, Japanese, Korean, or Vietnamese monarchs in the Chinese cultural sphere. The term however, is applied well beyond just East Asia.

The title was also given occasionally to another woman of the same generation, while a woman from the previous generation was sometimes given the title of grand empress dowager (Chinese and Japanese: 太皇太后; pinyin: tàihúangtàihòu; rōmaji: Taikōtaigō; Korean: 태황태후 (太皇太后); romaja: Tae Hwang Tae Hu; Vietnamese: Thái Hoàng Thái Hậu (太皇太后)). An empress dowager wielded power over the harem and imperial family. Numerous empress dowagers held regency during the reign of underage emperors. Many of the most prominent empress dowagers also extended their control for long periods after the emperor was old enough to govern. This was a source of political turmoil according to the traditional view of Chinese history.

Grand empress dowager (also grand dowager empress or grand empress mother) (Chinese and Japanese: 太皇太后; pinyin: tàihuángtàihòu; rōmaji: taikōtaigō; Korean: 태황태후 (太皇太后); romaja: Tae Hwang Tae Hu; Vietnamese: Thái Hoàng thái hậu (太皇太后) was a title given to the grandmother, or a woman from the same generation, of a Chinese, Japanese, Korean, or Vietnamese emperor in the Chinese cultural sphere.

Some grand empresses dowager held regency during the emperor's childhood. Some of the most prominent empress dowagers extended their regencies beyond the time when the emperor was old enough to govern alone. This was seen as a source of political turmoil, according to the traditional views of Chinese historians.

Zelkova serrata (Japanese zelkova, Japanese elm, keyaki, or keaki; Japanese: 欅, romanized: keyaki or 槻, tsuki; simplified Chinese: 榉树; traditional Chinese: 櫸樹; pinyin: jǔshù; Korean: 느티나무; RR: neutinamu) is a species of the genus Zelkova native to Japan, Korea, eastern China and Taiwan. It is often grown as an ornamental tree, and used in bonsai. There are two varieties, Zelkova serrata var. serrata in Japan and mainland eastern Asia, and Zelkova serrata var. tarokoensis (Hayata) Li on Taiwan which differs from the type in its smaller leaves with less deeply cut serration on the margins.

Old Chosŏn, also known as Gojoseon (Korean: 고조선; Hanja: 古朝鮮; RR: Gojoseon; MR: Kojosŏn) and its contemporary name Joseon (Korean: 조선; Hanja: 朝鮮; RR: Joseon; MR: Chosŏn), was the first kingdom on the Korean Peninsula. According to Korean mythology, the kingdom was established by the legendary king Tan'gun. Old Chosŏn possessed the most advanced culture in the Korean Peninsula at the time and was an important marker in the progression towards the more centralized states of later periods. The addition of Go (고; 古), meaning "old" or "ancient", is used in historiography to distinguish the kingdom from the Joseon dynasty, founded in 1392 CE.

According to the Memorabilia of the Three Kingdoms, Old Chosŏn was established in 2333 BCE by Tan'gun, who was said to be born from the heavenly prince Hwanung and a bear-woman, Ungnyeo. While Tan'gun is a mythological figure of whose existence no concrete evidence has been found, some interpret his legend as reflections of the sociocultural situations involving the kingdom's early development. Regardless, the account of Tan'gun has played an important role in the development of Korean identity. Today, the founding date of Old Chosŏn is officially celebrated as National Foundation Day in North and South Korea.

Goguryeo (37 BC – 668 AD) (Korean: 고구려; Hanja: 高句麗; RR: Goguryeo; lit. high castle; Korean pronunciation: [ko̞.ɡu.ɾjʌ̹]; Old Korean: Guryeo) also later known as Goryeo (Korean: 고려; Hanja: 高麗; RR: Goryeo; lit. high and beautiful; Korean pronunciation: [ko.ɾjʌ]; Middle Korean: 고ᇢ롕〮, kwòwlyéy), was a Korean kingdom which was located on the northern and central parts of the Korean peninsula and the southern and central parts of modern-day Northeast China (Manchuria). At its peak of power, Goguryeo encompassed most of the Korean peninsula and large parts of Manchuria, along with parts of eastern Mongolia, Inner Mongolia, and modern-day Russia.

Along with Baekje and Silla, Goguryeo was one of the Three Kingdoms of Korea. It was an active participant in the power struggle for control of the Korean peninsula and was also associated with the foreign affairs of neighboring polities in China and Japan.

Silla ([ɕiɭ.ɭa]; Old Korean: 徐羅伐, Yale: Syerapel, RR: Seorabeol; IPA: [sʌɾabʌɭ]) was a Korean kingdom that existed between 57 BCE and 935 CE and was located on the southern and central parts of the Korean peninsula. Silla, along with Baekje and Goguryeo, formed the Three Kingdoms of Korea. Silla had the lowest population of the three, approximately 850,000 people (170,000 households), significantly smaller than those of Baekje (3,800,000 people) and Goguryeo (3,500,000 people).

Its foundation can be traced back to the semi-mythological figure of Hyeokgeose of Silla (Old Korean: *pulkunae, "light of the world"), of the Park clan. The country was first ruled intermittently by the Miryang Park clan for 232 years and the Wolseong Seok clan for 172 years and beginning with the reign of Michu Isageum the Gyeongju Kim clan for 586 years. Park, Seok and Kim have no contemporary attestations and went by the Old Korean names of 居西干 Geoseogan (1st century BCE), 次次雄 Chachaung (1st century CE), 泥師今 Isageum (Old Korean: *nisokum) and 麻立干 Maripkan (5th-6th century) instead.