The Place Geologists Say Is Worth Flying to Hong Kong For—No Matter the Cost
“Geologists say: no matter how much it costs, you have to fly to Hong Kong for this.”
That might sound exaggerated—until you see it for yourself.
Most people think of Hong Kong as a city of skyscrapers, shopping, and Victoria Harbour’s skyline. But just beyond the urban edge lies something far more extraordinary: a geological site so rare, it feels almost unreal.
It looks less like Earth—and more like something out of science fiction.
To understand why, you have to rewind time by 140 million years.
Back then, Hong Kong was not a global financial hub. It was a violently active volcanic region. The Earth’s crust was unstable, magma surged beneath the surface, and eventually, a massive supervolcanic eruption reshaped the entire southeastern coastline.
Ash filled the sky. Lava and volcanic debris settled across the land. Over time, under immense pressure and heat, these materials slowly cooled and contracted.
And in that moment of cooling, something extraordinary formed.
Perfectly shaped hexagonal rock columns.
They look almost man-made—as if designed with precision tools, carefully measured and aligned. But every line, every angle, is the work of nature alone.
What makes Hong Kong’s hexagonal columns even more remarkable is their global significance. Spanning an area of about 100 square kilometers, this is the largest known formation of its kind in the world. Their variation in size, distinctive light-yellow tone, and exceptional preservation make them unique on a global scale.
This is not just “interesting rock.”
This is a preserved moment in Earth’s history.
Now picture yourself standing in front of the High Island Reservoir East Dam—home to the famous “Ten Thousand Columns Coast.” Towering vertical rock walls rise from the shoreline, tightly packed and stretching into the distance like a massive natural fortress.
It feels almost alien.
As if built by an ancient civilization.
But what you are actually seeing is the final frame of a prehistoric volcanic eruption.
These columns are more than scenery.
They are time—frozen in stone.
That is why geologists from around the world are willing to travel across continents just to witness this place.
And here is the part most people do not expect:
You do not need an expedition to get there.
No technical climbing. No multi-day trekking.
From Hong Kong’s city center, it takes just over an hour to reach one of the world’s most important geological wonders.
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So next time someone asks you, “What’s special about Hong Kong?”
You can answer simply:
“There’s a 140-million-year-old volcano here… and it never quite finished cooling.”
Join Splitdyboat’s Hong Kong UNESCO Global Geopark “Four Sea Arches Volcano Tour” and experience this world-class geological wonder up close.