Osaka

Osaka Prefecture occupies the Osaka Plain and the low hills that frame it, from the Hokusetsu uplands in the north to the Izumi mountains on the Wakayama border. Only Kagawa is smaller in area, but with nearly nine million residents Osaka ranks third in population after Tokyo and Kanagawa, and almost the whole lowland is built up. The cities of Osaka and Sakai are designated cities; dozens of others – Higashi-Ōsaka, Hirakata, Toyonaka, Suita, Takatsuki – form a continuous urban belt.

The prefecture has been a gateway since antiquity. Naniwa was an early imperial capital and the port for embassies to China; the Kawachi and Izumi plains hold the enormous keyhole-shaped tombs of the 4th- and 5th-century Yamato kings. From the late 16th century, Osaka became the commercial capital of Japan – the "kitchen of the nation" where rice and goods from every domain were traded.

Today Osaka is the economic core of western Japan, with headquarters of trading houses, pharmaceutical and electronics firms, and a dense network of small and mid-sized manufacturers, especially in Higashi-Ōsaka. It is also a major visitor destination, known for its food, comedy and the lively entertainment districts of Minami.

Ōsaka (大坂, "great slope") was the name of the upland at the end of the Uemachi plateau where the Ishiyama Hongan-ji and later Osaka Castle stood. The character 坂 (slope) was gradually replaced by 阪 in the Edo period and officially in the Meiji era, reportedly because 坂 can be read as "returning to earth" (土に返る), an inauspicious meaning. Osaka-fu was established in 1868; in 1881 it absorbed Sakai Prefecture (Izumi and Kawachi, which then also included Yamato), and Nara was separated again in 1887, leaving the present borders.

The Osaka Plain is built largely on sediments of the Yodo and Yamato rivers; much of the city of Osaka stands on reclaimed land and former river delta, some of it below sea level. The Uemachi plateau, a narrow ridge running north–south, carries Osaka Castle, Shitennō-ji and Sumiyoshi Taisha. The Ikoma and Kongō ranges form the eastern border with Nara, with Mount Kongō (1,125 m) rising on the border – its summit lies just inside Nara, while Osaka's highest ground is on its western flank; the Izumi range separates Osaka from Wakayama in the south.

Osaka Bay is shallow and heavily modified by reclamation – Kansai International Airport stands on artificial islands off Izumisano, and Yumeshima and Sakishima are artificial islands in the port of Osaka. The Yodo River, draining Lake Biwa, enters the bay through the New Yodo River, a channel dug in the Meiji period to protect the city from floods.

Osaka has a warm inland-sea climate: hot, humid summers with a strong urban heat-island effect, mild winters with little snow and relatively low annual rainfall. Typhoons can bring storm surges into Osaka Bay, which is protected by an extensive system of seawalls and floodgates.

The Mozu and Furuichi tomb groups, including the vast Daisen Kofun attributed to Emperor Nintoku, show that the Osaka Plain was a centre of the Yamato kingship in the 4th and 5th centuries. Naniwa served as a capital under Emperor Kōtoku after the Taika Reform (645). In the medieval period Sakai became a self-governing port city trading with China and Europe, while the Ishiyama Hongan-ji of the Jōdo Shinshū held out against Oda Nobunaga for ten years.

Toyotomi Hideyoshi built Osaka Castle on the Hongan-ji site from 1583 and made the city his capital. After the Tokugawa destroyed the Toyotomi in the sieges of 1614–1615, Osaka was rebuilt as a shogunal city and grew into the commercial centre of Japan, with the Dōjima rice exchange and merchant-sponsored culture such as bunraku and the Kaitokudō academy. In the early 20th century "Great Osaka" was briefly Japan's largest city. Osaka hosted Expo '70, Japan's first world exposition, and the 2025 World Expo on Yumeshima.

Osaka's culture grew from its merchant class. Bunraku puppet theatre, with plays by Chikamatsu Monzaemon, developed here, and the National Bunraku Theatre stands in Nipponbashi. Kamigata rakugo (comic storytelling) and manzai (stand-up comedy duos) are central to Osaka's identity, sustained by the Yoshimoto entertainment company. The Osaka dialect, with its direct, humorous tone, is the most widely heard form of Kansai-ben.

Osaka built its food culture on the goods that flowed through its markets – kombu from Hokkaidō, rice and fish from across western Japan. Kombu dashi underpins its udon and simmered dishes, while flour-based konamon (okonomiyaki, takoyaki) and kushikatsu define its street food. Senshū in the south adds onions and mizunasu aubergines, and the city's restaurants range from Kitashinchi's refined dining to the stand-up bars of Kyōbashi and Tenma.

Osaka Prefecture accounts for a large share of Japan's economic output, second only to Tokyo among the prefectures for most of the modern era. Traditional strengths in textiles and trading evolved into pharmaceuticals (Dōshōmachi has been the medicine district since the Edo period), electronics and home appliances (Panasonic, Sharp, Daikin), and a dense cluster of small manufacturers in Higashi-Ōsaka. Logistics through the Port of Osaka and Kansai International Airport, finance, retail and tourism complete the picture.