This is a 5.2-kilometer road connecting Katsure Peninsula and Heianza Island. The road is not a bridge, but a causeway built on top of an embankment, and has one bridge for vessel navigation and two channels for securing the tidal currents.
This road has a straight alignment, four lanes, and has become a typical symbolic road in Okinawa.
It was constructed as an industrial road, but is now a popular leisure spot.
Because this underwater road is built on an embankment, unlike bridges, you can look out over the ocean at almost the same height as your eye level.
And on either side of the road is a beautiful emerald green shallow sea.
The route from the main island of Okinawa to Heianza Island, Miyagi Island, and Ike Island along this road is a popular driving course.
And Sea Station Ayahashikan, located halfway along the road, is a road park with a parking lot, restrooms, and a road information room.
The facility is also equipped with a restaurant and shower facilities for marine recreation.
The park also has a marine culture museum and a direct sales store, where visitors can buy woven rush grass mushiro, handicrafts, and Okinawan souvenirs.
Construction of the underwater road began in 1971 and opened the following year as a two-lane road; the four-lane road was completed in 1999, and a road park was completed in the middle of the road. In 1999, the four-lane road was completed and a road park was completed in the middle of the road. The bridge used to circulate the sea water was also replaced with a longer one.
140 minutes by bus from Naha Bus Terminal