Osaka Bay (大阪湾 Ōsaka-wan Japanese: [oːsakaꜜwaɴ]) is an inland bay in western Japan, on the eastern side of the Seto Inland Sea. It is separated from the Pacific Ocean by the Kii Channel and from the neighbor western part of the Inland Sea by the Akashi Strait. Its western shore is formed by Awaji Island, and its northern and eastern shores are part of the Kansai metropolitan area.
Major ports on Osaka Bay include Osaka, Kobe, Nishinomiya, Sakai, Amagasaki, and Hannan.
The Yodo River (淀川, Yodo-gawa), also called the Seta River (瀬田川 Seta-gawa) and the Uji River (宇治川 Uji-gawa) at portions of its route, is the principal river in Osaka Prefecture on Honshu, Japan. The source of the river is Lake Biwa in Shiga Prefecture to the north.
The Yodo River, usually called the Seta River in Shiga Prefecture, begins at the southern outlet of the lake in Ōtsu. There is a dam there to regulate the lake level. Further downstream, the Seta flows into Kyoto Prefecture and its name changes to the Uji River. It then merges with two other rivers, the Katsura River and the Kizu River in Kyoto Prefecture. The Katsura has its headwaters in the mountains of Kyoto Prefecture, while the Kizu comes from Mie Prefecture. From the three-river confluence, the river is called the Yodo River, which flows south, through Osaka, and on into Osaka Bay. In Osaka, part of the river has been diverted into an artificial channel; the old course in the heart of Osaka is called the Kyū-Yodo River (literally, 'Former Yodo River'). It serves as a source of water for irrigation and also powers hydroelectric generators.
Osaka Prefecture (大阪府, Ōsaka-fu; pronounced [oː.sa.ka, oː.sa.kaꜜ.ɸɯ]) is a prefecture of Japan located in the Kansai region of Honshu. Osaka Prefecture has a population of 8,778,035 (as of 1 April 2022) and has a geographic area of 1,905 square kilometres (736 sq mi). Osaka Prefecture borders Hyōgo Prefecture to the northwest, Kyoto Prefecture to the north, Nara Prefecture to the southeast, and Wakayama Prefecture to the south.
Osaka is the capital and largest city of Osaka Prefecture, and the third-largest city in Japan, with other major cities including Sakai, Higashiōsaka, and Hirakata. Osaka Prefecture is located on the western coast of the Kii Peninsula, forming the western is open to Osaka Bay. Osaka Prefecture is the third-most-populous prefecture, but by geographic area the second-smallest; at 4,600 inhabitants per square kilometre (12,000/sq mi) it is the second-most densely populated, below only Tokyo. Osaka Prefecture is one of Japan's two "urban prefectures" using the designation fu (府) rather than the standard ken for prefectures, along with Kyoto Prefecture. Osaka Prefecture forms the center of the Keihanshin metropolitan area, the second-most-populated urban region in Japan after the Greater Tokyo area and one of the world's most productive regions by GDP.
Kobe (/ˈkoʊbeɪ/ KOH-bay; Japanese: 神戸, romanized: Kōbe, pronounced [koꜜː.be] ), officially Kobe City (神戸市, Kōbe-shi; [koː.beꜜ.ɕi]), is the capital city of Hyōgo Prefecture, Japan. With a population of around 1.5 million, Kobe is Japan's seventh-largest city and the third-largest port city after Tokyo and Yokohama. It is located in the Kansai region, which makes up the southern side of the main island of Honshū, on the north shore of Osaka Bay. It is part of the Keihanshin metropolitan area along with Osaka and Kyoto. The Kobe city centre is located about 35 km (22 mi) west of Osaka and 70 km (43 mi) southwest of Kyoto.
The earliest written records regarding the region come from the Nihon Shoki, which describes the founding of the Ikuta Shrine by Empress Jingū in AD 201. For most of its history, the area was never a single political entity, even during the Tokugawa period, when the port was controlled directly by the Tokugawa shogunate. Kobe did not exist in its current form until its founding in 1889. Its name comes from Kanbe (神戸; an archaic title for supporters of the city's Ikuta Shrine). Kobe became one of Japan's designated cities in 1956.
The Seto Inland Sea (瀬戸内海, Seto Naikai), sometimes shortened to the Inland Sea, is the body of water separating Honshu, Shikoku, and Kyushu, three of the four main islands of Japan. It serves as a waterway connecting the Pacific Ocean to the Sea of Japan. It connects to Osaka Bay and provides a sea transport link to industrial centers in the Kansai region, including Osaka and Kobe. Before the construction of the San'yō Main Line, it was the main transportation link between Kansai and Kyūshū.
Yamaguchi, Hiroshima, Okayama, Hyōgo, Osaka, Wakayama, Kagawa, Ehime, Tokushima, Fukuoka, and Ōita prefectures have coastlines on the Seto Inland Sea; the cities of Hiroshima, Iwakuni, Takamatsu, and Matsuyama are also located on it.
The Port of Osaka (大阪港, Ōsaka-kō) is the main port in Japan, located in Osaka within Osaka Bay. The Port of Osaka also has several sister ports including the Port of Busan.
The Akashi Strait (明石海峡, Akashi Kaikyō) is a strait between the Japanese islands of Honshu and Awaji. The strait connects Seto Inland Sea and Osaka Bay. The width of the Akashi Strait is approximately 4 kilometers, and maximum depth is about 110 meters. The fastest tidal current is about 4.5 metres per second (8.7 knots).
The 1.5-kilometer strait is one of the important points of the Seto Inland Sea and is at the mouth of the Pacific Ocean. The surrounding waters around Akashi Strait is a known fishery area. The Akashi Strait is designated as an international shipping channel by the Maritime Traffic Safety Act in Japan.
Kansai International Airport (Japanese: 関西国際空港, romanized: Kansai Kokusai Kūkō; IATA: KIX, ICAO: RJBB), commonly known as Kankū (Japanese: 関空), is located on an artificial island and serves as the primary international airport in the Greater Osaka Area of Japan and the closest international airport to the cities of Osaka, Kyoto, and Kobe. It is located on an artificial island, Kankūjima (関空島), in the middle of Osaka Bay off the Honshu shore, 38 km (24 mi) southwest of Ōsaka Station, located within three municipalities, including Izumisano (north), Sennan (south), and Tajiri (central), in Osaka Prefecture. The airport's first airport island covers approximately 510 hectares (1,260 acres) and the second covers approximately 545 hectares (1,347 acres), for a total of 1,055 hectares (2,607 acres).
Kansai opened on 4 September 1994 to relieve overcrowding at Osaka International Airport, also called Itami Airport, which is closer to Osaka. It consists of two terminals: Terminal 1 and Terminal 2. Terminal 1, designed by Italian architect Renzo Piano, is the longest airport terminal in the world with a length of 1.7 km (1+1⁄16 mi). The airport serves as an international hub for All Nippon Airways, Japan Airlines, and Nippon Cargo Airlines and as a hub for Peach, the first international low-cost carrier in Japan. It is also the north Pacific hub for FedEx Express, which obtained fifth freedom rights under the 1998 U.S. and Japan air agreement and established the hub in 2014.