The tunnel goes on and on under the bay. Then the road tilts up, the ceiling disappears, and suddenly you're on an island in the middle of the sea — with Tokyo glittering on one side and Yokohama on the other.
Umihotaru — "sea firefly" — is a parking area built on an artificial island in the middle of Tokyo Bay. Very few rest stops in the world are this dramatic.
Umihotaru PA is on the Tokyo Bay Aqua-Line, the 15.1 km road between Kawasaki and Kisarazu. You reach it through an undersea tunnel from Kawasaki or over a long bridge from Chiba. It's more scenic than social — fewer modified cars than Daikoku, far better views.
Where it is
The Tokyo Bay Aqua-Line links Kawasaki in Kanagawa with Kisarazu in Chiba. From the Kawasaki side you dive into a long undersea tunnel and surface on the island. From the Kisarazu side you cross a long, low bridge over the water. Umihotaru sits where the tunnel meets the bridge.
What it's like
- A multi-level building with shops, restaurants and observation decks
- Open sea views on every side, with distant skylines
- A mix of tourists, families and car fans — smaller car meets than Daikoku
- One of the best spots near Tokyo to photograph your car at sunset
Tolls
The Aqua-Line has its own tolls, separate from the Shuto Expressway. For a standard car with ETC, the weekday toll is around ¥800. On weekends and holidays, ETC tolls change by time of day as part of a traffic experiment and can be noticeably higher in the busiest hours. Check the current rate before you go.
When to go
- Weekday evenings are calm and easy.
- Weekend afternoons can bring heavy traffic heading back towards Kawasaki — one reason tolls are higher then.
- Sunset is the magic hour for photos.
Head up to the observation deck. The wind is strong, but looking down at the bridge disappearing into the sea is worth the bad hair.
How we use Umihotaru
Umihotaru is one of our backup spots when Daikoku is closed — and a highlight in its own right. Driving the undersea tunnel in a GT-R is something you'll remember.
Frequently asked questions
Can I walk around Umihotaru?
Yes. Once you've parked, the shops and decks are open to visitors during opening hours.
Is Umihotaru a car meet?
Not in the same way as Daikoku. You'll see interesting cars, but it's mainly a scenic rest area.
How long does it take from Tokyo?
It depends on traffic and your starting point; from the bay area it's often under an hour.
Can I get to Umihotaru by bus?
Some highway buses use the Aqua-Line, but for car culture you'll want your own wheels.