Question: What area in East Asia has two distinct sovereign states and has Chitinimonas koreensis in its greenhouse soil?

Context paragraphs:
Chitinimonas koreensis: Chitinimonas koreensis is a Gram-negative, catalase- and oxidase-positive motile bacterium with a single flagellum of the genus "Chitinimonas" and the family Burkholderiaceae which was isolated from greenhouse soil in Korea.

Korea: Korea is a historic country in East Asia, since 1945 divided into two distinct sovereign states: North Korea (officially the "Democratic People's Republic of Korea") and South Korea (officially the "Republic of Korea").  Located on the Korean Peninsula, Korea is bordered by China to the northwest and Russia to the northeast.  It is separated from Japan to the east by the Korea Strait and the Sea of Japan (East Sea).

Solitalea koreensis: Solitalea koreensis is a Gram-negative, rod-shaped and non-spore-forming bacterium from the genus of Solitalea which has been isolated from greenhouse soil in Yongin in Korea.

Brownback trevally: The brownback trevally, "Carangoides praeustus" (also known as the brown-backed trevally), is a species of small inshore marine fish classified in the jack family, Carangidae.  The brownback trevally is distributed in two populations through the tropical waters of the Indo-west Pacific region, ranging from the Persian Gulf east to India, South East Asia and the Indonesian islands.  The species is distinguished from similar species by its completely scaled breast and black-tipped second dorsal fin, and is known to reach a maximum length of 25 cm.  The brownback trevally inhabits inshore waters including bays and estuaries, where it preys on demersal crustaceans and small fish.  Other aspects of its biology are poorly known, and it is of minor importance to fisheries, occasionally caught by hook and line or trawls.  William Smith-Vaniz has recently suggested the two distinct populations may actually represent two distinct species.

Great tit: The great tit ("Parus major") is a passerine bird in the tit family Paridae.  It is a widespread and common species throughout Europe, the Middle East, Central and Northern Asia, and parts of North Africa where it is generally resident in any sort of woodland; most great tits do not migrate except in extremely harsh winters.  Until 2005 this species was lumped with numerous other subspecies.  DNA studies have shown these other subspecies to be distinctive from the great tit and these have now been separated as two distinct species, the cinereous tit of southern Asia, and the Japanese tit of East Asia.  The great tit remains the most widespread species in the genus "Parus".

Sovereign state: A sovereign state is, in international law, a nonphysical juridical entity that is represented by one centralized government that has sovereignty over a geographic area.  International law defines sovereign states as having a permanent population, defined territory, one government, and the capacity to enter into relations with other sovereign states.  It is also normally understood that a sovereign state is neither dependent on nor subjected to any other power or state.

East Asian studies: East Asian studies is a distinct multidisciplinary field of scholarly enquiry and education that promotes a broad humanistic understanding of East Asia past and present.  The field includes the study of the region's culture, written language, history, and political institutions.  East Asian Studies is located within the broader field of Area studies and is also interdisciplinary in character, incorporating elements of the social sciences (anthropology, economics, sociology, politics etc.) and humanities (literature, history, art, film, music, etc.), among others.  The field encourages scholars from diverse disciplines to exchanges ideas on scholarship as it relates to the East Asian experience and the experience of East Asia in the world.  In addition, the field encourages scholars to educate others to have a deeper understanding of, and appreciation and respect for, all that is East Asia and, therefore, to promote peaceful human integration worldwide.

Korean nationality: Korean nationality (Korean: 한국국적 ) refers to citizenship of the Korea.  Korean citizen (Korean: 한국인 ) refers to citizen of the Korea.  Korea is divided into two distinct sovereign states, North Korea (Democratic People's Republic of Korea) and South Korea (Republic of Korea).  Nowadays, there are three kinds of Korean nationality: South Korean nationality, North Korean nationality, and Chōsen-seki (ethnic Koreans in Japan who have neither Japanese nor South Korean citizenship).

Beech: Beech ("Fagus") is a genus of deciduous trees in the family Fagaceae, native to temperate Europe, Asia and North America.  Recent classification systems of the genus recognize ten to thirteen species in two distinct subgenera, "Engleriana" and "Fagus".  The "Engleriana" subgenus is found only in East Asia, and is notably distinct from the "Fagus" subgenus in that these beeches are low-branching trees, often made up of several major trunks with yellowish bark.  Further differentiating characteristics include the whitish bloom on the underside of the leaves, the visible tertiary leaf veins, and a long, smooth cupule-peduncle. " Fagus japonica", "Fagus engleriana", and the species "F. okamotoi", proposed by the botanist Chung-Fu Shen in 1992, comprise this subgenus.  The better known "Fagus" subgenus beeches are high-branching with tall, stout trunks and smooth silver-grey bark.  This group includes "Fagus sylvatica", "Fagus grandifolia", "Fagus crenata", "Fagus lucida", "Fagus longipetiolata", and "Fagus hayatae".  The classification of the European beech, "Fagus sylvatica" is complex, with a variety of different names proposed for different species and subspecies within this region (for example "Fagus taurica", "Fagus orientalis", and "Fagus moesica").  Research suggests that beeches in Eurasia differentiated fairly late in evolutionary history, during the Miocene.  The populations in this area represent a range of often overlapping morphotypes, though genetic analysis does not clearly support separate species.

Two layer hypothesis: The 'Two Layer' Hypothesis, or immigration hypothesis, is an archaeological theory that suggests the human occupation of mainland Southeast Asia occurred over two distinct periods by two separate racial groups, hence the term 'layer'.  According to the Two Layer Hypothesis, early indigenous Australo-Melanesian peoples comprised the first population of Southeast Asia before their genetic integration with a second wave of inhabitants from East Asia, including Southern China, during the agricultural expansion of the Neolithic.

Supporting paragraphs: Chitinimonas koreensis Korea
Answer: Korea