What if you could walk to another island?
In Japan, this is actually possible.
Even more surprising—
you can walk under the sea and cross a strait on foot.
From Honshu to Kyushu,
you can cross the Kanmon Strait by walking.
Even better—
it’s completely free and open from 6:00 AM to 10:00 PM.
I actually walked from Shimonoseki (Honshu) to Moji (Kyushu).
In this article, you’ll see what it’s like to walk under the sea.
You Can Walk Under the Sea
Between Honshu and Kyushu lies the Kanmon Strait.
Most people cross it by train or by car, but there is also a pedestrian tunnel beneath the sea.
👉 Kanmon Pedestrian Tunnel
- Length: about 780m
- Walking time: about 15 minutes
- Cost: Free
👉 It’s a rare experience where you can walk under the ocean to another island.
【Video】Walking Inside the Undersea Tunnel👇
Inside the tunnel👇
- Gentle slope
- Blue walls with fish illustrations
- A long, straight path
👉 It feels surreal—you’re walking beneath the ocean.
Highlight: Crossing Between Islands Under the Sea
In the middle of the tunnel👇
you cross from Honshu to Kyushu
👉 A long, straight path
“This line marks the boundary between Honshu and Kyushu—right under the sea.”
Walking under the sea and reaching another island—this is something truly unique.
“Mission complete — I crossed from Honshu to Kyushu under the sea.”
How Long Does It Take?
👉 About 15 minutes
It’s quicker than you might expect.
What It Feels Like
- Weatherproof
- Stable temperature
- Free
- Unique experience
👉 Simple, but unforgettable.
Summary
The Kanmon Pedestrian Tunnel offers:
- Walking under the sea
- Crossing between major islands
- Free access
👉 A truly unique experience you won’t find in many places
A Hidden Detail You Shouldn’t Miss
There’s also a small but fun detail in this tunnel.
On both sides—Shimonoseki and Moji—
you’ll find commemorative stamps.
When you collect both,
they form a single complete design.
👉 A unique two-part commemorative stamp
It’s a great little souvenir, so don’t miss it.
t’s a simple walk—but a truly unforgettable experience.
