umihotaru kisarazu artificial island|observation deck|tokyo bay aqua line| Undersea Aqua Tunnel 

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Umihotaru (Kisarazu artificial island)
This island was built as a transition point and a rest area between the tunnel and bridge sections. It features resting facilities including restaurants and kiosks, a parking area, as well as operation and control facilities.
This is the only shopping mall on the sea where you can enjoy panoramic 360º views of Tokyo Bay, as well as many shops, restaurants and services.