Claimed to be the longest suspension bridge structure in the world, the Kurushima Kaikyo Bridge is actually 3 connected suspension bridges. Its total length is a tad over 4 kilometers, a little longer than the Akashi Kaikyo Bridge further along the Inland Sea which also connects to Shikoku and is still, I believe, the longest suspension bridge in the world.
I walked across it on the third day of my walk along the Shimanami Kaido, the route that connects Honshu to Shikoku via a series of bridges across the islands.
If you are on foot like I was, or cycling or using a moped then the crossing is much more than 4k as a series of gradually rising loops take you up and down to the height of the bridge.
The bridge connects Imabari on Shikoku with Oshima. I had crossed Oshima fairly quickly after spending the night on Michika Island in view of the Hakata-Oshima Bridge. Later I will post some shots of the stupendous views from the Kurushima Kaikyo Bridges....