Honshū–Shikoku Bridge Project

The Honshu-Shikoku Bridge Project (本州四国連絡橋, Honshū-Shikoku Renraku-kyō) is a system of bridges connecting the islands of Honshu and Shikoku across the Inland Sea of Japan, which were previously only connected by ferry.

[1] Crossing the Akashi Strait, this connection links Hyōgo Prefecture on Honshu with Tokushima Prefecture on Shikoku, using Awaji Island for most of its length.

The Akashi Kaikyō Bridge was the world's longest suspension bridge at the time of its construction in 1998, and connects Kobe to Awaji Island (Awaji, Hyogo).

The others are the Ōnaruto Bridge, connecting Awaji to Ōge Island (Naruto, Tokushima) across the Naruto Strait, and the Muya Bridge [ja] connecting Ōge Island with Shikoku.

The Seto-Chūō bridges are also used by JR trains (Seto-Ōhashi Line), and are designed to accommodate high-speed Shinkansen service in the future, although there are no current plans to extend the Shinkansen to Shikoku.