Kawasaki Artificial Island

What it is

• A circular artificial island with a 200-meter diameter located five kilometers off the coast.
• A ventilation facility for the Tokyo Wan Aqua-Line tunnel that opened in December 1997.
• A monitoring post used to track the water quality of Tokyo Bay.
• A restricted site featuring a helipad and a small ship berth for maintenance access.

What to see

• Two cylindrical ventilation towers featuring a distinct blue and white striped design.
• The taller ventilation tower which reaches a height of 90 meters.
• The shorter ventilation tower standing 75 meters above the water.
• A massive man-made island structure visible from the surrounding bay waters.

Notes written by Japan Gems from facts in Japanese Wikipedia.