Akinada Tobishima Kaido

The Akinada Tobishima Kaidō (安芸灘とびしま海道), officially the Akinada Islands Link Bridges (安芸灘諸島連絡架橋, Akinada-shotō-renraku-kakyō), is a road connecting Kure, Hiroshima to seven of the Geiyo Islands in the Seto Inland Sea, Japan.^[1]

Map of Akinada Tobishima Kaido
Solid blue line: operational (bridges 1–7)
Dotted blue line: planned (bridge 8)
Dotted red line: possible extension to Omishima
Green line: Shimanami Kaido

Route

The route spans 46.5 kilometres (28.9 miles), with a maximum altitude difference of 67 metres (220 feet).^[2] Along its length are seven bridges with a cumulative length of 5,300 m (17,400 ft), connecting the islands of Shimokamagari, Kamikamagari [ja], Toyoshima, Ōsakishimojima, Herashima [ja] and Nakanoshima [ja] before terminating at Okamura Island.^[1] The seventh of the bridges, Okamura Bridge, crosses the border from Hiroshima Prefecture to Ehime Prefecture. The entire route has gentle gradients, marked cycle lanes and is equipped with five designated cycle stations,^[2] making this a popular cycling destination.^[3]

An eighth bridge connecting Okamura to Ōsakikamijima is planned, but construction has not started.^[4] An alternative series of bridges to Ōmishima Island has also been proposed.^[5] Currently, there are ferry services from Okamura to Ōmishima and the city of Imabari, Ehime in Shikoku.^[6]

Nickname

After a public naming competition that received 3,118 entries, the route was given the official nickname Akinada Tobishima Kaidō in 2008.^[7] Akinada (Aki Sea) is the open expanse west of the Geiyo Islands, while tobishima comes from tobi-ishi (飛び石), the Japanese name for stepping stones in a garden.^[1][8] The route is also unofficially known as the Ura-Shimanami Kaidō (裏しまなみ海道) after the nearby Shimanami Kaido expressway, which connects Onomichi (Hiroshima) and Imabari (Ehime), going through nine of the Geiyo Islands, including Ōshima, Ōmishima, and Innoshima.^[9]

Bridges

Name		Japanese	Connecting	Opened	Length	Type	Notes
1	Akinada Bridge	安芸灘大橋	Honshu - Shimokamagari	18 Jan 2000	1175 m[10]	Three-span, two-hinge suspension bridge
2	Kamagari Bridge	蒲刈大橋	Shimokamagari - Kamikamagari	October 1979	480 m[11]	Three-span two-continuous truss bridge
3	Toyoshima Bridge	豊島大橋	Kamikamagari - Toyoshima	18 Nov 2008	903 m[12]	Single span suspension bridge	Also known as Abi Bridge (アビ大橋)
4	Toyohama Bridge	豊浜大橋	Toyoshima-Osakishimojima	30 Nov 1992	543 m[13]	Three-span continuous truss bridge
5	Heira Bridge	平羅橋	Osakishimojima - Herashima	1995	98.5 m[14]	Cable-stayed bridge	Also known as the "Orange Line" (オレンジライン)
6	Nakanoseto Bridge	中の瀬戸大橋	Herashima - Nakanoshima	6 November 1998	251 m[15]	Arch bridge
7	Okamura Bridge	岡村大橋	Nakanoshima - Okamura Island	1995	228 m[16]	Arch bridge		Future connection planned to Ōmishima Island
8	（planned）		Okamura Island - Osakikamijima	-	-	-	Planning phase, no date for start of construction

• 
  Akinada Bridge
• 
  Kamagari Bridge
• 
  Toyoshima Bridge
• 
  Toyohama Bridge
• 
  Heira Bridge
• 
  Nakanoseto Bridge
• 
  Okamura Bridge