Kumamoto Castle
One of Japan's three premier castles. Black walls, curved 'musha-gaeshi' stone bases. Under post-2016-quake restoration but the keep is again accessible.
Open in Maps ↗Prefecture profile · 都道府県
Kumamoto 熊本県
Kyūshū's traditional samurai centre — Kumamoto Castle is one of Japan's three premier castles — and the country's surprise semiconductor capital after TSMC's $20B+ fab opened in Kikuyō in 2024. Aso has the largest active volcanic caldera in the world.
Capital
Kumamoto City
Population
1.71 million
Area
7,409 km²
Region
Kyūshū
History
Kumamoto Castle, built by daimyō Katō Kiyomasa in 1607, is one of Japan's three premier castles (with Himeji and Matsumoto). Its black walls and curved 'musha-gaeshi' stone bases held off Saigō Takamori's 1877 Satsuma Rebellion siege for 52 days. The April 2016 Kumamoto earthquakes badly damaged the castle; restoration is scheduled to complete around 2052.
Mt. Aso has the world's largest active volcanic caldera (25 km north-south × 18 km east-west) — large enough that towns, train lines, and farms sit inside it. The central Mt. Nakadake crater is one of the few volcanoes globally where tourists can stand at the rim of an actively erupting magma cone.
In 2021, TSMC announced JASM — its first-ever Japanese semiconductor fab — in Kikuyō, Kumamoto, with the Japanese government providing ~¥476 billion in subsidy. The first fab (28/22nm and 16/12nm) opened in February 2024; a second fab (6/7nm) is under construction. The deal repositions Kumamoto as Japan's primary leading-edge logic-chip cluster.
Economy & business
Kumamoto's prefectural GDP is around ¥6.4 trillion (US$44 billion) — growing fast since the TSMC announcement. Sony Semiconductor Solutions has its largest CMOS image-sensor fab here; Tokyo Electron Kyushu (semiconductor equipment), Honda's Kumamoto motorcycle plant (largest in Japan), agriculture (tomatoes #1, watermelon #1, basashi raw horse meat, Kumamoto wagyū), and the Aso volcanic-tourism economy.
Key industries
Semiconductors
TSMC/JASM (28/22nm and 16/12nm logic; second fab for 6/7nm in build); Sony Semiconductor Kumamoto (the largest CMOS image-sensor fab in the world — supplies most iPhone cameras); Tokyo Electron Kyushu (semiconductor capital equipment).
Motorcycles & automotive
Honda Kumamoto — the world's largest motorcycle plant, producing the Super Cub and CB lines for global export.
Agriculture & livestock
Japan's #1 producer of tomatoes (Yatsushiro), watermelon, and dehydrated radish; basashi (raw horse meat) is a Kumamoto specialty; Aso-grown Kumamoto wagyū.
Tourism (Aso & Kurokawa)
Mt. Aso volcanic-rim observatories; Kurokawa Onsen — a small hot-spring village ranked among Japan's best for its consistently low-rise, traditional ryokan landscape.
Place branding (Kumamon)
Kumamon, the prefecture's black-bear mascot launched in 2010, is estimated to have generated more than ¥1.5 trillion in cumulative economic impact through licensing alone — globally cited as a regional-mascot success story.
Notable companies
JASM (TSMC Japan)Sony Semiconductor Solutions KumamotoTokyo Electron KyushuHonda Kumamoto FactoryRe:Build (Kumamoto Castle restoration partner)Higo BankKumamoto Family Bank
Trade partners
TaiwanChinaUnited StatesSouth KoreaThailand
Tourism highlights
Mt. Aso
World's largest active volcanic caldera. Nakadake's crater rim — when conditions permit — lets visitors stand metres from an active vent.
Open in Maps ↗Kurokawa Onsen
Carless, low-rise hot-spring village in northern Kumamoto; consistently ranked among Japan's best ryokan towns.
Open in Maps ↗Suizenji Garden
Edo-period strolling garden in Kumamoto City — a scaled-down replica of the Tōkaidō road, with a small Mt. Fuji built from earth.
Open in Maps ↗Amakusa islands
Christian-history coastal islands once home to large hidden-Christian communities; dolphin-watching, beaches, and seafood.
Open in Maps ↗Tsujun Bridge
1854 aqueduct that still irrigates 100 hectares of rice; weekly summer water releases shoot 6,000 litres of water out the side of the bridge in a controlled flood.
Open in Maps ↗Did you know
Mt. Aso's caldera is the largest active volcanic caldera on Earth — towns, JR rail lines, and farms all sit inside the rim, with about 50,000 people living within the caldera.
Sony's Kumamoto fab is currently the world's largest manufacturing site for CMOS image sensors — the camera chips inside most iPhones (and many Android flagships) are made here.
Kumamon was created in 2010 as a low-cost prefectural tourism mascot — it has since generated an estimated ¥1.5 trillion in cumulative economic impact and is held up as the modern template for Japanese 'yuru-kyara' regional mascots.
About Kumamoto — Frequently asked
What is the capital of Kumamoto?
The capital of Kumamoto is Kumamoto City.
What region of Japan is Kumamoto in?
Kumamoto is part of the Kyūshū region of Japan.
What are Kumamoto's main industries?
Kumamoto's key industries include Semiconductors, Motorcycles & automotive, Agriculture & livestock, Tourism (Aso & Kurokawa).
What are the top tourist attractions in Kumamoto?
Top attractions in Kumamoto include Kumamoto Castle, Mt. Aso, Kurokawa Onsen, Suizenji Garden.
What major companies are based in Kumamoto?
Notable companies headquartered in Kumamoto include JASM (TSMC Japan), Sony Semiconductor Solutions Kumamoto, Tokyo Electron Kyushu, Honda Kumamoto Factory, Re:Build (Kumamoto Castle restoration partner).
Map
Scroll to zoom, drag to pan, tap a prefecture to open its chapter.