|Native name: 対馬|
|Area||708.7 km2 (273.63 sq mi)|
|Coastline||915 km (568.6 mi)|
|Highest elevation||649 m (2,129 ft)|
|Highest point||Mt. Yatate|
|Largest city||Tsushima, Nagasaki|
|Population||39,716 (as of 2006)|
|Density||58.18 /km2 (150.69 /sq mi)|
|Ethnic groups||Japanese people|
Tsushima Island (対馬, Tsushima) is an island of the Japanese archipelago situated in the middle of the Tsushima Strait at 34°25'N and 129°20'E. The main island of Tsushima was once a single island, but the island was divided into two in 1671 by the Ōfunakosiseto canal and into three in 1900 by the Manzekiseto canal. Tsushima is composed of North Tsushima Island (Kami Jima), South Tsushima Islands (Shimo Jima), and over 100 smaller islands. Generally the name Tsushima refers to all the islands. The main three islands are the largest island of Nagasaki Prefecture and the fourth largest in Japan (excluding Honshu, Kyushu, Shikoku and Hokkaido). The city of Tsushima encompasses the entire island.
Tsushima Island is located west of the Kanmon Strait at a latitude between Honshu and Kyushu of the Japanese mainland. The Tsushima Strait splits at the Tsushima Island Archipelago into two channels; the wider channel, also closer to the mainland of Japan, is the Tsushima Strait. Ōfunakoshi-Seto and Manzeki-Seto, the two canals built in 1671 and 1900 respectively, connect the deep indentation of Asō Bay to the east side of the island. The archipelago comprises over 100 smaller islets in addition to the main island.
Tsushima is the closest Japanese territory to the Korean Peninsula, lying approximately 50 km from Busan (Pusan); on a clear day, the hills and mountains of the Korean peninsula are visible from the higher elevations on the two northern mountains. The nearest Japanese port Iki, situated entirely in the Tsushima Basin, is also 50 km away. Tsushima Island and Iki Island contain the Iki–Tsushima Quasi-National Park, designated as a nature preserve and protected from further development. Much of Tsushima, 89%, is covered by natural vegetation and mountains.
The Japanese government administers Tsushima Island as a single entity, although artificial waterways have separated it into two islands connected by the narrow isthmus outlined by the Aso Bay. The northern area is known as Kamino-shima (上島), and the southern island as Shimono-shima (下島). Both sub-islands have a pair of mountains: Shimo-no-shima has Mount Yatate (矢立山), 649 m (2,130 ft) high, and Ariake-yama (有明山), 558 m (1,831 ft) high. Kami-no-shima has Mi-take (御嶽), 487 m (1,598 ft). The two main sections of the island are now joined by a combination bridge and causeway. The island has a total area of 696.26 km2.
Tsushima has a marine subtropical climate strongly influenced by the monsoon winds. The average temperature is 15.5°C, and the average yearly precipitation is 2,132.6 mm. The highest temperature ever recorded on the island is 36.0°C, in 1966, and the lowest –8.6°C, in 1895. Mostly throughout the year, Tsushima is 1 – 2°C cooler than the city of Nagasaki. The island's rainfall is generally larger than that of the main islands of Japan, which is attributed to the difference in their size. Because Tsushima is small and isolated, it is exposed on all sides to moist marine air, which releases precipitation as it ascends the island's steep slopes. Continental monsoon winds carry loess (yellow sand) from China in the spring and cool the island in the winter. The rainy season begins and ends later than other areas in Nagasaki Prefecture, and Tsushima rarely suffers direct hits by typhoons.
The island is inhabited by Tsushima cat, wild boar, deer, martens, and mice. Migrating birds that make stops on island include hawks, harriers, eagles, and Black-throated Loons. Forest, which covers 90% of the island, consists of broad-leafed evergreens, conifers, and deciduous trees, including cypress. Honey bees are common, with many used to produce commercial honey.
Tsushima Reef, in the bay between Tsushima and Iki Island, is the northernmost coral reef in the world, surpassing the Iki Island reef discovered in 2001. It is dominated by cool-tolerant stony or Scleractinian Favia corals but the observed settling of tropical Acropora coral is expected to provide an ongoing indicator for continuing global warming.
According to a 2000 census, 23.9% of the local population is employed in primary industries, while 19.7% and 56.4% of the population are employed in secondary and tertiary industries, respectively. Of these economic activities, fishing amounts to 82.6% of the primary industry, with much of it dedicated to catching squid on the eastern coast of the island. The number of employees in the primary industries has been decreasing, while employee growth in the secondary and tertiary industries has increased.
Tourism, targeting mainly South Koreans, has recently made a great contribution to the islands' economy. The number of Korean tourists to the island increased greatly after the launching of a high-speed ferry service from Busan to the island in 1999. In 2008, 72,349 Koreans visited the island. Due to a drop in the value of the won, the number fell to 45,266 in 2009. Korean tourists generate an estimated ¥2.1 billion in revenue for the local economy and generate about 260 jobs on the island.
Tsushima Airport serves the island.
Early history 
Japanese mythology states that Tsushima was one of the eight original islands created by the Shinto deities Izanagi and Izanami. Archeological evidence suggests that Tsushima was already inhabited by settlers from the Japanese archipelago and Korean Peninsula from the Jōmon period to the Kofun period. According to the Sanguo Zhi, a Chinese historical text, a thousand families in Tsushima founded the Tsuikaikoku (対海国). It was one of the about 30 that composed the Yamataikoku union countries. These families exerted control over Iki Island, and established trading links with Yayoi Japan. Since Tsushima had almost no land to cultivate, islanders earned their living by fishing and trading.
Beginning in the early 6th century, Tsushima was a province of Japan, known as Tsushima Province.
Under the Ritsuryō system, Tsushima became a province of Japan. This province was linked with Dazaifu, the political and economical center of Kyūshū, as well as the central government of Japan. Due to its strategic location, Tsushima played a major role in defending Japan against invasions from the Asian continent and developing trade lines with Baekje and Silla of Three Kingdoms of Korea. After Baekje, which was helped by Japan, was defeated by Silla and Tang Dynasty forces at the Battle of Hakusukinoe in 663, Japanese border guards were sent to Tsushima, and Kaneda Castle was constructed on the island.
Tsushima Province was controlled by the Tsushima no Kuni no miyatsuko (対馬国造) until the Nara period, and then by the Abiru clan until the middle of the 13th century. The role and title of "Governor of Tsushima" was exclusively held by the Shōni clan for generations. However, since the Shōni actually resided in Kyūshū, it was the Sō clan, known subjects of the Shōni, who actually exerted control over these islands. The Sō clan governed Tsushima until the late 15th century.
Medieval history 
Tsushima was an important trade center during this period. After the Toi invasion, private trade started between Goryeo, Tsushima, Iki, and Kyūshū, but halted during the Mongol invasions of Japan between 1274 and 1281. The Goryeosa, a history of the Goryeo dynasty, mentions that in 1274, Korean troops of the Mongol army led by Kim Bang-gyeong that included many Korean soldiers killed a great number of people on the islands.
Tsushima became one of the major bases of the Wokou, Japanese pirates, also called wakō, along with the Iki and Matsuura. Due to repeated pirate raids, the Goryeo dynasty and the subsequent Joseon Dynasty, at times placated the pirates by establishing trade agreements, as well as negotiating with the Muromachi shogunate and its deputy in Kyūshū, and at times used force to neutralize the pirates. In 1389, General Pak Wi (朴威) of Goryeo attempted to clear the island of Wokou pirates, but uprisings in Korea forced him to return home.
On June 19, 1419, the recently-abdicated king Sejong the Great sent general Yi Jong-mu to an expedition to Tsushima island to clear it of the Wokou pirates, using a fleet of 227 vessels and 17,000 soldiers, known in Japanese as the Ōei Invasion. The Japanese samurai drove out the Korean army to the Korean Peninsulaon July 3, 1419., and Korea gave up occupation of Tsushima. In 1443, the Daimyo of Tsushima, Sō Sadamori proposed a Gyehae treaty. The number of trade ships from Tsushima to Korea was decided by this treaty, and the Sō clan monopolized the trade with Korea.
In 1510, Japanese traders initiated an uprising against Joseon's stricter policies on Japanese traders from Tsushima and Iki coming to Busan, Ulsan and Jinhae to trade. The So Clan supported the uprising, but it was soon crushed. The uprising was later came to be known as the "Three-Ports Incident" (三浦の乱 (Sanbo-No-Ran) in Japan and 삼포왜란 in Korea). Trade resumed under the direction of King Jungjong in 1512, but only under strictly limited terms, and only twenty-five ships were allowed to visit Joseon annually.
In the late 16th century, Japanese leader Toyotomi Hideyoshi united the various feudal lords (daimyo) under his command. Planning to unite all factions with a common cause, Hideyoshi's coalition invaded Joseon Dynasty Korea in an attack leading to the Seven-Year War. Tsushima was the main naval base for this invasion, and in continuing support of the war, large numbers of Korean prisoners were transported to Tsushima until 1603.
After Japan's attempts at conquest failed, peace was re-established between the two nations. Once again, the islands became a port for merchants. Both the Joseon Dynasty and the Tokugawa shogunate sent their trading representatives to Tsushima, governing trade until 1755.
Until the Meiji era, Tsushima's status as a frontier between Japan and Korea, its heavy dependence on the Trade with Korea, as well as its unique institutions/systems of trade (which strongly resembled those of Korean, not Japanese, institutions - for instance, Measurement system for the taxation of land in Japan, is determined by the production of rice(Koku) However, Tsushima where the quantity of production of a rice is poor was permitted the unique survey system (間高(Kendaka)) by Tokugawa shogunate. Because it had originated in China Land Survey System(間尺法), was similar to the system of Korea - gyeolbu (腋邛嘱); Tsushima law resembled Korean law in its calculation of finances; "unfree labor" or slavery for fixed periods of time, always rare in any form in the rest of Japan, existed as an established institution, often as a form of punishment, in Tsushima as it did in Korea; The Tsushima han owned a 330,000-square meter place of residence in Busan, according to Murai Shosuke, the Japanese was given the title from the Joseon dynasty is called "marginal men", was responsible for security in this residential area. set it apart from other territories of Japan. The islanders spoke a dialect of Japanese and their daily customs, social structure, and economic interactions were of Japanese, with exception of loanwords from Korean in their language. 
Modern history 
As a result of the abolition of the han system, the Tsushima Fuchu domain became part of Izuhara Prefecture in 1871. In the same year, Izuhara Prefecture was merged with Imari Prefecture, which was renamed Saga Prefecture in 1872. Tsushima was transferred to Nagasaki Prefecture in 1872, and its districts of Kamiagata (上県) and Shimoagata (下県) were merged to form the modern city of Tsushima. This change was part of widespread reforms within Japan which started after 1854. Japan was at this time becoming a modern nation state and regional power, with widespread changes in government, industry, and education.
After the First Sino-Japanese War ended with the Treaty of Shimonoseki, Japan felt humiliated when the Triple Intervention of the three great powers of Germany, France, and Russia forced it to return the valuable Liaodong Peninsula to China under threat of force. Consequently, the Japanese leadership correctly anticipated that a war with Russia or another Western imperial power was eventually likely. Between 1895 and 1904, the Japanese navy blasted the Manzeki-Seto canal 25 m wide and 3 m deep, which was later expanded to 40 m wide and 4.5 m deep (Nagasaki prefectural website), through a mountainous rocky isthmus of the island, between Aso Bay to the west and Tsushima Strait to the east, technically dividing the island into three islands (topographical map). Strategic concerns explain the scope and funding of the canal project by Japan during an era when it was still struggling to establish an industrial economy. The canal enabled the Japanese to move transports and warships quickly between their main naval bases in the Inland Sea (directly to the east), via the Kanmon and Tsushima Strait, into the Korea Strait, or to destinations beyond in the Yellow Sea.
During the Russo-Japanese War in 1905, the Russian Baltic Fleet under Admiral Rozhestvensky, after making an almost year-long trip to East Asia from the Baltic Sea, was crushed by the Japanese under Admiral Togo Heihachiro at the Battle of Tsushima. The Japanese third squadron (cruisers) began shadowing the Russian fleet off the tip of the south island, and followed it through the Tsushima Strait where the main Japanese fleet waited. The battle began at slightly east-northeast of the northern island around midday, and ended to its north a day later when the Japanese surrounded the Russian Fleet. Few battles in history have been so decisive.
In 1950, the South Korean government asserted sovereignty over the island based on "historical claims". Korea-US negotiations about the Treaty of San Francisco made no mention Tsushima Island. After this, the status of Tsushima as an island of Japan was re-confirmed. While the South Korean government has since relinquished claims on the island, some Koreans (including some members of the Korean parliament) have periodically attempted to dispute the ownership of the island.
In the 1973 one of the transmitters for the OMEGA-navigation system was built on Tsushima. It was dismantled in 1998.
Today, Tsushima is part of Nagasaki Prefecture of Japan. On March 1, 2004, the six towns on the island, including Izuhara, Mitsushima, Toyotama, Mine, Kami-agata, and Kami-tsushima, were merged to create the city of Tsushima. About 700 Japan Self-Defense Forces personnel are stationed on the island to watch the local coastal and ocean areas.
Notable people from Tsushima 
See also 
- History of Japan
- Japan–Korea disputes
- Tsushima Island dispute
- Sō clan
- Tsushima Fuchū Domain
- Tsushima Province
- Tsushima Subprefecture
- OMEGA Navigation System Shushi-Wan Transmitter
- (Japanese) 市勢要覧（資料編） - Data about Tsushima
- (Japanese) 国土交通省国土地理院 九州地方測量部「長崎県山岳標高」 - Kyushu Regional Survay Department, Geographical Survay Institute, Ministry of Land, Infrastructure, Transport and Tourism in Japan
- MaqQuest on Tsushima Island's coordinates.
- location of Tsushima.
- Info on Tsushima Shi
- "Google Maps". Retrieved 2008-05-02.
- "Google Maps". Retrieved 2008-05-02.
- Asahi.com article on Tsushima
- Aerial view of the junction between the two islands of Tsushima Island
- Water level view of the junction between the two islands of Tsushima Island
- Meteorologic data in Izuhara (厳原), Tsushima by Japan Meteorological Agency
- Meteorologic data in Izuhara (厳原), Tsushima by Japan Meteorological Agency - most ~ 10th largest value on record
- Meteorologic data in Nagasaki (長崎) by Japan Meteorological Agency
- BBC article on typhoons
- Nicol, C.W., "Hark ye to the Donkey's Ears", Japan Times, March 7, 2010, p. 12.
- Hiroya Yamano et al., in the on-line journal Geology, 12 July 2012, reported by Joost DeVries at Reefbuilders and at Advanced Aquarist
- Kaneko, Maya, (Kyodo News) "Tsushima's S. Koreans: guests or guerrillas?", Japan Times, March 5, 2010, p. 3.
- "朝鮮王朝実録世宗4卷1年7月3日" Annals of the Joseon DynastyKing SejongVol.4 July 3 
- "朝鮮王朝実録世宗4卷1年7月9日" Annals of the Joseon DynastyKing SejongVol.4 July 9  "세종 4권, 1년(1419 기해 / 명 영락(永樂) 17년) 7월 9일(임자) 5번째기사이원이 막 돌아온 수군을 돌려 다시 대마도 치는 것이 득책이 아님을 고하다"
- Tsushima tourist Association WEB site "1443 嘉吉条約（発亥約定）- 李氏朝鮮と通交条約である嘉吉条約を結び、歳遣船の定数を定める。これにより、宗家が朝鮮貿易の独占的な地位を占めるようになる。"
- Klaproth, Julius. (1832). San kokf tsou ran to sets, ou Aperçu général des trois royaumes, p. 96; excerpt, "... et vis-à-vis de l'île de Toui ma tao (Tsou sima) qui fait partie du Japon ...."
- Walraven, Boudewijn et al. (2007). Korea in the middle: Korean studies and area studies, pp. 359–361
- Murai Shosuke
- Lewis, J.B. Frontier contact between Chosŏn Korea and Tokugawa Japan, page 30. Lewis also cites the official preparations of So Yoshitoshi listing some 1,000 Koreans as guides in preparation for Hideyoshi's invasions of Korea to support a "zone of ambiguous boundary qualities" aspect of Tsushima. 
- Lewis, J.B. Frontier contact between Chosŏn Korea and Tokugawa Japan, page 33. 
- US Department of State. (1906). A digest of international law as embodied in diplomatic discussions, treaties and other international agreements (John Bassett Moore, ed.), Vol. 5, p. 759.
- "U.S. State Department, Report from the Office of Intelligence Research: Korea´s Recent Claim to the Island of Tsushima (prepared on March 30, 1950)"; retrieved 2013-4-2.
- "Memorandum of Conversation, by the Officer in Charge of Korean Affairs in the Office of Northeast Asian Affairs (Emmons)," Foreign Relations 1951, Vol. VI, pp. 1202-1203; excerpt, "Mr. Dulles ntoed that paragraph 1 of the Korean Ambassador's communication made no reference to the island of Tsushima and the Korean Ambassador agreed that this had been omitted."
- US Bureau of the Census. (1965). Foreign Commerce and Navigation of the United States, p. lv.
Further reading 
- Ian Nish, A Short History of JAPAN, 1968, LoCCC# 68-16796, Fredrick A. Praeger, Inc., New York, 238 pp.
- British Title and Publisher: The Story of Japan, 1968, Farber and Farber, Ltd.
- Edwin O Reischauer, Japan - The Story of a Nation, 1970, LoCCC# 77-10895 Afred A. Knopf, Inc., New York. 345 pp. plus index.
- Previously published as Japan Past and Present, 4 Editions, 1946–1964.
- Shiraki K, Konda N, Sagawa S, Park YS, Komatsu T, Hong SK (December 1985). "Diving pattern of Tsushima male breath-hold divers (Katsugi)". Undersea Biomed Res 12 (4): 439–52. PMID 3936250. Retrieved 2008-07-22.
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|Wikisource has the text of the 1911 Encyclopædia Britannica article Tsu-shima.|