Tsushima Province

Overview

Tsushima Province (対馬国, Tsushima no Kuni) was an old province of Japan, one of the administrative divisions that structured the country before the modern prefectural system. The province occupied Tsushima Island, a landmass in the Korea Strait between the Japanese archipelago and the Korean Peninsula. Its territory corresponds to the modern-day city of Tsushima, located in Nagasaki Prefecture. The province was sometimes referred to by the abbreviated name Taishū (対州).

The island’s position made it a frontier zone, closer to the Korean coast than to the main Japanese islands. Tsushima Province functioned as a gateway for diplomatic and commercial exchange with Korea, and its lords held a distinctive role as intermediaries in relations between the two countries.

History

Tsushima Province was established as part of the ancient provincial system, which took shape during the seventh and eighth centuries under the ritsuryō legal codes. The province was governed by a kokushi, an official appointed by the central court. Because of its strategic location, the island’s governance often carried a military character, and local lords gradually accumulated power over the centuries.

During the medieval period, the Sō clan emerged as the dominant ruling family of Tsushima. The Sō controlled the island and managed its crucial role in trade with Korea, particularly through the port of Fuchū. The province’s lords maintained a delicate balance: they were vassals of the Japanese shogunate, yet they also cultivated close ties with the Korean court, which granted them trading privileges.

In the early modern era, the Sō clan continued to rule Tsushima Province under the Tokugawa shogunate. The province was organised as the Tsushima-Fuchū Domain, a feudal domain centred on the island. The domain’s lords held the official title of daimyō and were responsible for overseeing Japanese-Korean diplomacy, including the reception of Korean embassies that travelled to Japan. This arrangement persisted until the abolition of the han system in 1871, when the domain was dissolved and Tsushima was incorporated into Nagasaki Prefecture.

Territory and Influence

Tsushima Province consisted of the island of Tsushima itself, which is divided into a northern and a southern section by a narrow isthmus. The island’s rugged terrain limited agriculture, so the province’s economy relied heavily on fishing, trade, and the transit of goods between Japan and Korea. The provincial capital was located at Fuchū, on the island’s eastern coast, which served as the administrative and commercial centre.

The province’s influence extended well beyond its physical territory. Because Tsushima sat on the main sea route between Japan and the Korean Peninsula, its rulers controlled a vital chokepoint for maritime traffic. The Sō clan leveraged this position to become indispensable brokers in official relations between the Japanese shogunate and the Korean kingdom. Korean embassies, known as Chōsen tsūshinshi, routinely stopped at Tsushima on their way to Edo, and the province’s lords managed the logistics and protocol of these missions.

Tsushima also served as a conduit for cultural and material exchange. Chinese and Korean books, ceramics, and other goods flowed through the island into Japan, while Japanese products moved in the opposite direction. The province’s influence was therefore not merely territorial but diplomatic and commercial, making it a singular outpost within the Japanese provincial system.

The Name in Japanese

The Japanese name for the province is 対馬国.

• Kana reading: つしまのくに (Tsushima no kuni)
• Romaji: Tsushima no Kuni

The name breaks down as follows:

• 対 (tsu): This kanji means "opposite" or "facing." In this word, it is read as tsu, a reading that does not appear in standard modern compounds but is preserved in the place name. The character suggests the island’s position facing the Asian continent.

• 馬 (ma): This kanji means "horse." Here it is read as ma, contributing to the phonetic value of the name. The combination of 対 and 馬 yields the reading Tsushima, though the characters themselves do not literally describe horses or facing.

• 国 (kuni): This kanji means "country" or "province." It is read as kuni, and in the context of the old provincial system it designates an administrative unit. The same character appears in the names of other provinces, such as 武蔵国 (Musashi no Kuni) and 肥前国 (Hizen no Kuni).

The full name, Tsushima no Kuni, thus reads as "the province of Tsushima." The abbreviated form Taishū (対州) uses the first character 対 with the suffix 州, which also means "province" and was commonly appended to provincial names in literary or formal usage.

Legacy

The legacy of Tsushima Province persists in the geography and identity of modern Tsushima. Although the province was formally abolished in the late nineteenth century, the island retains the name Tsushima, now the city of Tsushima in Nagasaki Prefecture. The historical role of the province as a bridge between Japan and Korea remains a central theme in the island’s cultural memory.

The Sō clan’s former seat at Fuchū survives as the city’s historic core, and the island’s museums and archives preserve records of the diplomatic missions and trade that defined the province. The name Tsushima no Kuni appears in historical documents, maps, and literary works, reminding readers of a time when the island was not merely a remote outpost but a distinct province with its own lords, laws, and international responsibilities.

For students of Japanese, the province’s name offers a window into the old administrative vocabulary, where the suffix 国 (kuni) marked a unit of territory. The reading Tsushima, with its unusual phonetic use of 対 and 馬, also illustrates how place names in Japan often preserve archaic readings that differ from standard modern usage.