🌋 Hong Kong’s Hidden Supervolcano: Stepping Into the Otherworld of High Island
Author: Hansley (Founder of SplitdyBoat)
Date: 23/5/2026
Out in the eastern waters of Hong Kong, there is a place that many people pass by—but very few ever truly step into.
This is not just another mountain, and it is definitely not an ordinary coastline.
It is the remains of a supervolcano—High Island.
As you approach from the sea, the first thing you notice is the striking formation of hexagonal rock columns rising straight out of the shoreline. At a glance, they feel almost unreal. Too precise. Too structured. It is hard not to wonder whether they were formed by nature at all—or left behind by something else.
🌋 They are that perfectly aligned.
But what you are looking at is the result of a massive volcanic eruption that took place around 140 million years ago. Not a typical eruption, but one powerful enough to reshape the entire landscape.
Each of these hexagonal columns formed as molten rock cooled and contracted under intense heat and pressure. Over time, nature carved and revealed them into what we see today—a geological formation that feels almost out of place in Hong Kong.
What makes this experience truly special is that you are not limited to viewing it from afar.
You can step into it.
Instead of standing at a lookout point, you move alongside the columns, walk between them, and even approach from the sea. From this perspective, High Island is no longer just a scenic spot—it becomes a space you actively explore.
Some areas resemble towering walls. Others feel like a forest of stone pillars. In certain sections, the landscape looks like a cross-section of the Earth itself, as if layers of geological history have been sliced open and put on display.
With every step, it feels like you are turning a page in the planet’s past.
When sunlight hits the rock surface, the textures and patterns come alive. These lines are not decorative—they are physical records of time, pressure, and transformation.
At some point, you begin to realize something:
You are not just looking at scenery.
You are standing inside the aftermath of an ancient event.
And it is something that photos can never fully capture.
🌋 What Is the High Island Supervolcano Experience?
This is more than just sightseeing—it is a full geological exploration:
- Walk through one of the world’s largest hexagonal rock column formations
- Observe volcanic structures up close and understand how they formed
- Learn how a supervolcano shaped Hong Kong’s landscape
- Access the coastline from the sea for a completely different perspective
- Discover how coastal erosion continues to reshape the terrain
🌋 Why Is It Worth Visiting?
Because nothing here is man-made.
There are no filters, no installations, and no artificial design. Yet the landscape feels more surreal than many constructed attractions.
What you see here is entirely created by the Earth itself—and it exists in this form only in a few places in the world.
🌋 How Can You Explore It?
There are several ways to experience High Island:
- Guided unesco global geopark tours led by professional guides by SplitdyBoat
- Boat or speedboat routes that take you into the core coastal areas
- Combined activities such as snorkeling or coasteering, depending on the itinerary
Each approach offers a completely different way of seeing the landscape.
🌋 What Does It Feel Like?
It is not just awe-inspiring.
It is perspective-shifting.
You start to see Hong Kong differently—not just as a dense, modern city, but as a place shaped by immense natural forces over millions of years.
And by the time you leave, one thought tends to stay with you:
There is far more to Hong Kong than you ever expected.
Splitdyboat ｜ Signature UNESCO Global Geopark Tours invites you to experience this side of Hong Kong for yourself.