四国と本州を結ぶルートはいくつあるか？その橋の名称は？瀬戸内海にある島の数は？瀬戸内海の島の大きさトップ5は？瀬戸内海で泳ぐイノシシとは？

🟣瀬戸内海にある島の数は？

Do you have any idea how many islands there are in the Seto inland sea?

↓

727 islands

海上保安庁の調査では外周が100m以上の島は瀬戸内海には合計7 2 7 島ある(2県に重複する5島を除いた数)。

外周が 100m未満の小さな島を含めると更に多くなる。

●URL https://city.saijo.ehime.jp/uploaded/attachment/3135.pdf

🟣The Seto Inland Sea (瀬戸内海) is the body of water separating Honshū, Shikoku, and Kyūshū.

Yamaguchi, Hiroshima, Okayama, Hyōgo, Osaka, Wakayama, Kagawa, Ehime, Tokushima, Fukuoka, and Ōita prefectures have coastlines on the Seto Inland Sea.

🟣瀬戸内海の海岸線に接する県は？

↓

山口、広島、岡山、兵庫、大阪、和歌山、徳島、香川、愛媛、大分、福岡

(11府県)

🟣四国と本州を結ぶルートはいくつあるか？橋の名称は？

↓

https://en.m.wikipedia.org/wiki/Honshū–Shikoku_Bridge_Project

◼️3ルート

「神戸・鳴門ルート」

「児島・坂出ルート」

「尾道・今治ルート」

●Akashi-Kaikyo Bridge (明石市と淡路島)　Ōnaruto Bridge (淡路島と鳴門市)

●Great Seto Bridge (倉敷市と坂出市)

https://en.m.wikipedia.org/wiki/Great_Seto_Bridge

●the Shimamaki Kaido (尾道市と今治市)

●明石海峡大橋

https://en.m.wikipedia.org/wiki/Akashi_Kaikyo_Bridge

The Akashi Kaikyo Bridge (Japanese: 明石海峡大橋, Hepburn: Akashi Kaikyō Ōhashi) is a suspension bridgewhich links the city of Kobe on the Japanese island of Honshu to Iwaya on Awaji Island.

It is part of the Kobe-Awaji-Naruto Expressway, and crosses the busy and turbulent Akashi Strait (Akashi Kaikyō in Japanese). It was completed in 1998, and has the second longest central span of any suspension bridge in the world, at 1,991 metres (6,532 ft), only behind the 1915 Çanakkale Bridge that was opened in March 2022.

●神戸新聞

https://www.kobe-np.co.jp/news/sougou/202203/sp/0015148420.shtml

トルコ西部チャナッカレのダーダネルス海峡に世界最長のつり橋が完成し、2022年3月18日に開通式が開かれた。つり橋の規模を示す２本の主塔間の距離は２０２３メートルに達し、世界一だった兵庫県の神戸市と淡路市を結ぶ明石海峡大橋を抜いた。

●瀬戸大橋

https://en.m.wikipedia.org/wiki/Great_Seto_Bridge

The Great Seto Bridgeor Seto Ohashi Bridge(瀬戸大橋, Seto Ōhashi)^{[1][note 1]} is a series of double deck bridges connecting Okayamaand Kagawa prefectures in Japan across a series of five small islands in the Seto Inland Sea. Built over the period 1978–88, it is one of the three routes of the Honshū–Shikoku Bridge Projectconnecting Honshū and Shikoku islands and the only one to carry rail traffic.

The total length is 13.1 kilometers (8.1 mi), and the longest span, the Minami Bisan-Seto Bridge, is 1,100 m (3,600 ft).

As a road-rail bridge, the length is the world’s longest class.

●a road-rail bridge

https://en.m.wikipedia.org/wiki/List_of_road–rail_bridges

●坂出市HP

https://www.city.sakaide.lg.jp/soshiki/seisaku/setoohashibridge.html

世界最大級　瀬戸大橋は、上部が自動車道路と下部に鉄道の２段構造になっています。
道路と鉄道の２段構造になっている６つの橋と４つの高架橋をあわせた総延長１３．１km（道路鉄道併用部分）は、道路鉄道併用橋では世界最大級です。

●しまなみ海道

https://en.m.wikipedia.org/wiki/Nishiseto_Expressway

The Nishiseto Expressway(西瀬戸自動車道, Nishiseto Jidōsha-dō), often called the Shimanami Kaidō (しまなみ海道) is an expressway in Japanthat connects Onomichi, Hiroshima and Imabari, Ehime, going through nine of the Geiyo Islands, including Ōshima, Ōmishima, and Innoshima. The road and multiple bridges crossing across the Seto Inland Sea is one of the three main transportation links of the Honshū–Shikoku Bridge Project, constructed between the islands of Honshu and Shikoku.