Yamaguchi Prefecture

Yamaguchi Prefecture sits at the westernmost end of Honshu, Japan’s main island, within the Chūgoku region. As of early 2018, its population was roughly 1.38 million, spread across an area of about 6,112 square kilometers. The prefecture’s capital is Yamaguchi City, though the largest city is Shimonoseki. To the north lies Shimane Prefecture, and to the northeast, Hiroshima Prefecture. Yamaguchi is bordered by the Sea of Japan to the north and the Seto Inland Sea to the south, with the Kanmon Straits separating it from the island of Kyushu.

The prefecture was formed from the merger of two old provinces: Suō and Nagato. During the Heian and Kamakura periods, powerful samurai clans—the Ouchi family in Suō and the Koto family in Nagato—rose to prominence. In the Muromachi period, Ouchi Hiroyo, the 24th head of the Ouchi clan, unified both areas. The Ouchi modeled their city planning after Kyoto, grew wealthy through trade with Korea and Ming China, and fostered a refined culture that earned Yamaguchi the nickname “Kyoto of the West.” After internal strife, the Sue clan defeated the Ouchi, only to be overthrown by Mōri Motonari, whose family then controlled the Chūgoku region. During the Sengoku period, Yamaguchi was part of the Mōri domain. Mōri Terumoto lost to Tokugawa Ieyasu at the Battle of Sekigahara in 1600 and was confined to Suō and Nagato, where he built Hagi Castle and launched the “Three Whites” campaign—promoting salt, rice, and paper—to strengthen the local economy.

After Commodore Perry opened Japan, clans from Nagato (also called Chōshū) were instrumental in toppling the Tokugawa shogunate and establishing the new imperial government. Four years after the Meiji government formed in 1868, Yamaguchi Prefecture was officially created. The Meiji era brought modern policies and industry, though agriculture remained central. During the Taishō period (1912–1926), shipbuilding, chemical, machinery, and metalworking plants sprang up in the prefecture’s Seto Inland Sea harbors. After World War II, petrochemical complexes helped Yamaguchi become one of Japan’s most industrialized prefectures.

As of April 2012, 7% of Yamaguchi’s land was designated as natural parks. These include Setonaikai National Park; Akiyoshidai, Kita-Nagato Kaigan, and Nishi-Chūgoku Sanchi Quasi-National Parks; and several prefectural parks such as Chōmonkyō, Iwakiyama, Rakanzan, and Toyota.

The prefecture contains thirteen cities and several towns organized into districts. For economic analysis, Yamaguchi is often grouped with Northern Kyushu, functioning as a satellite of the Kanmon Straits metropolitan area despite not being on Kyushu island.

Demographically, Yamaguchi experienced negative population growth from 1955 to 1973 and again from 1985 onward.

Tourism draws many visitors to Shimonoseki, home to the Karato Fish Market and a large summer fireworks festival. The Kintai Bridge in Iwakuni, a five-arched wooden structure, is a symbol of western Honshu; the nearby banks of the Nishiki River are a popular spot for cherry blossom viewing in early April. Hagi City, in the north, is known for its traditional character—its post boxes are painted green or brown instead of the usual red. The Hagi Museum, modeled after a samurai residence, features rotating exhibits and a permanent collection on local history and Takasugi Shinsaku. Hagi also has a reverberatory furnace designated as a World Heritage Site. A local specialty, kawara soba, consists of green tea noodles fried on a hot tile and topped with egg, beef, green onions, and grilled liver—a dish that originated during the Seinan Rebellion when soldiers cooked on hot tiles. Akiyoshidai Quasi-National Park, containing Japan’s longest cave, Akiyoshido, is another popular destination.

Notable festivals include the Kintaikyo Festival (April 29), Nishiki River Water Festival (August), Iwakuni Festival (August), Yokomichi Festival (November 19), Yanai Goldfish Lantern Festival (August), Yamaguchi Gion Festival (July 20–27), Yamaguchi Tanabata Lantern Festival (August 6–7), Hagi Era Festival (April), Hagi Festival (August 2–3), Shimonoseki Strait Festival (May 2–4), and the Shimonoseki Firework Festival (August).

The prefecture hosts several universities: Baiko Gakuin University, National Fisheries University, Shimonoseki City University, Tokyo University of Science (Yamaguchi campus), Ube Frontier University, University of East Asia, Yamaguchi Gakugei College, Yamaguchi Prefectural University, and Yamaguchi University.