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The Hong Kong UNESCO Global Geopark Four Sea Arches Volcano Sightseeing Boat Tour

The Geopark Four Sea Arches Volcano Sightseeing Tour is a guided boat adventure through the Hong Kong UNESCO Global Geopark that takes you up close to the world's largest hexagonal volcanic columns and the four largest sea arches in the East China Seas .

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🌋 The Geology Behind the Scenery

The rock formations you'll see are 140 million years old—remnants of a massive Jurassic supervolcano that once dominated this region . The distinctive hexagonal columns were formed when volcanic ash cooled and contracted into these geometric pillars, creating a landscape so unique it's recognized as a UNESCO Global Geopark.

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🌋 What You'll See Along the Route

The tour follows a carefully curated route that showcases the Geopark's most spectacular features. The express version (2.5 hours) covers 8 key attractions, while the signature tour (4 hours) explores over 11 sights . Highlights include:

・ High Island – Shore of Thousand Columns – A coastline packed with thousands of hexagonal volcanic rock pillars 

・ Po Pin Chau – Organ Cliff – Towering columns resembling a giant pipe organ, rising up to 60 metres from the sea 

・ Wang Chau – Little Taiwan Cave – A striking sea arch shaped like the island of Taiwan, plus the Sea Palace, a 300-metre cliff wall of volcanic columns 

・ Basalt Island – Guan Dao Cave – The largest sea arch in Hong Kong 

・ Bluff Island – Tunnel Cave – A 30-metre tunnel carved through volcanic rock 

・ Jin Island – Bell Cave – A dramatic bell-shaped sea arch framed by towering basalt columns 

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🌋 What to Expect

You'll depart from Sai Kung and cruise through the Geopark on either a speedboat or yacht, depending on your chosen package . Throughout the journey, a knowledgeable guide provides commentary on the volcanic geology and history. If wave conditions permit, you may even get the chance to cross through one of the sea arches by speedboat . The tour is suitable for all ages, with photography assistance included so you can capture the perfect shot. 

LEARN MORE: The Geopark Four Sea Arches Volcano Sightseeing Tour - Splitdyboat

The Hong Kong UNESCO Global Geopark Double Sea Arches Volcano Coasteering Experience

The Geopark Double Sea Arches Volcano Coasteering Experience is a guided adventure that takes you into the water to explore Hong Kong's UNESCO Global Geopark coastline . Instead of viewing volcanic rock formations from a boat or a clifftop, you'll swim, scramble, and climb your way through iconic sea arches and caves . It's the ultimate way to get up close and personal with 140-million-year-old volcanic rock .

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The Geology Behind the Scenery

The same ancient volcanic activity that created the hexagonal columns of Po Pin Chau also formed the dramatic sea arches and caves you'll explore. The shoreline of the Sai Kung Volcanic Rock Region is a showcase of these geological wonders—formed over millions of years by relentless waves carving tunnels and arches through the towering hexagonal pillars . This is a UNESCO Global Geopark for a reason: the rock formations here are some of the most spectacular and accessible in the world .

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What You'll See Along the Route

The tour focuses on two of the most famous sea arches in the East China Seas, both part of the Ung Kong Group . Your coasteering route typically includes:

• Bluff Island Cave (Sha Tong Hau Cave) – A 30-metre sea tunnel carved through volcanic rock. You'll swim through this natural tunnel, entering at the west entrance and emerging from the east . The cave features stunning hexagonal columns hanging from the ceiling, resembling intricate ice sculptures .
• Bell Cave (Tiu Chung Arch) on Jin Island – A dramatic 30-metre-high bell-shaped sea arch, considered one of the region's most spectacular geological landmarks . You'll swim through the arch and explore the surrounding coastline, where sunlight filtering through the rock creates an ethereal glow .

Along the way, you'll be immersed in a landscape of towering rock columns, hidden channels, and wave-sculpted cliffs that feel a world away from Hong Kong's urban bustle .

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What to Expect

Your experience begins with a 30-minute safety and geology briefing at the Sai Kung Public School, where you'll be fitted with a helmet, life jacket, and gloves . You'll then take a speedboat to the Geopark site. Once in the water, you'll spend approximately 60–90 minutes coasteering—alternating between swimming through arches, scrambling over low rocks, and tackling optional cliff jumps . All jumps are optional, and the route is designed for beginners with basic swimming ability and water confidence . Your guide will provide support, safety instructions, and even help you capture the perfect photo .

LEARN MORE: The Geopark Double Sea Arches Volcano Coasteering Experience - Splitdyboat

The Hong Kong UNESCO Global Geopark Ninepin Group Island Hopping Experience

The Ninepin Group Island Hopping Experience is a guided speedboat tour that takes you to explore the Ninepin Group (果洲群島) in the Sai Kung Volcanic Rock Region , one of Hong Kong's most spectacular geological destinations. Part of the Hong Kong UNESCO Global Geopark, this archipelago is home to the world's largest cluster of hexagonal volcanic rock columns—formed by a supervolcano eruption 140 million years ago .

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The Geology Behind the Scenery

The Ninepin Group's hexagonal columns are part of the "Early Cretaceous Acidic Volcanic Rock Columnar Joints," which were designated among the first 100 International Union of Geological Sciences (IUGS) geological heritage sites in 2022 [citation:17]. These columns, averaging 1.2 metres in diameter and reaching heights of up to 100 metres, are composed of rhyolitic volcanic rock—unlike the more common basalt columns found elsewhere in the world . The entire formation spans over 100 square kilometres across the Sai Kung Volcanic Rock Region .

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What You'll See Along the Route

The tour departs from Tseung Kwan O South Landing, with just a 15-minute scenic speedboat ride to the islands . You'll explore up to 8 attractions across both North and South Ninepin Islands:

North Ninepin Island – "View the Rocks"

• Moon Cliff & Big Cannon Rock – Broad slopes with hexagonal rock patterns and a massive horizontally extending rock column resembling a giant cannon 
• No. 200 Lighthouse – Known as the "Beacon of the East Sea," offering stunning views of surrounding volcanic formations 
• Big Stove Arch – A spectacular double-connected sea arch you can walk on top of 
• Silver Bottle Sanctuary – Towering cliffs with columns over 2 metres wide and 50 metres high 
• Spiral Staircase Rock – A unique volcanic formation where columns twist upward in a spiral pattern 

South Ninepin Island – "Discover the Caves"

• Tiger Mouth Arch – The largest sea cave in the Ninepin Group, running through the island's centre and resembling a tiger's open mouth 
• Ninepin Sea Stack – Six closely clustered sea stacks rising dramatically from the sea 

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What to Expect

The full experience lasts 2.5 hours from check-in to return . You'll spend approximately 90 minutes on North Ninepin Island and 30 minutes on South Ninepin Island, with the remaining time dedicated to boat transfers and sightseeing around the islands . A knowledgeable guide provides commentary on the geology and natural history throughout the journey . The tour is suitable for children as young as 6 years old and requires no special equipment, though sturdy hiking shoes and long pants are recommended for the uneven coastal terrain .

LEARN MORE: The Ninepin Group Island Hopping Experience

For Details with Photos Explanation, Please Visit this BLOG: About the Snorkelling Destination of Volcano Sightseeing + Snorkelling Experience Combo

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Where Would Be the Snorkelling Destination?

The Guided Snorkelling Experience takes you to some of Hong Kong's most pristine and biodiverse marine areas, carefully selected based on weather and sea conditions to ensure the best visibility and safety . While the exact location depends on the day's conditions, here are some of the stunning snorkel sites you might visit:

Potential Snorkel Sites You Might Visit (One of the Following)

🪸 Long Mong Wan (浪茫灣)

Hong Kong's Largest Stony Corals Area

Long Mong Wan is home to the largest stony coral coverage in Hong Kong, making it a premier destination for underwater exploration. The area boasts a rich diversity of hard coral species, creating a vibrant underwater landscape teeming with marine life. Snorkellers can expect crystal-clear waters and the chance to observe a thriving coral ecosystem up close.

🪸 Kau Sai Wan (滘西灣)

Seasonal Infinity Pools & Hidden Coral Sites

Kau Sai Wan offers a unique snorkelling experience with its seasonal infinity pools that appear after heavy rain, nestled within the rugged coastline. Beyond the pools lie hidden coral sites, where snorkellers can discover a variety of marine species in a more secluded setting. The combination of rock pools and offshore coral areas makes this a versatile and exciting destination.

🪸 Sharp Island West (橋咀洲西)

Hong Kong's Largest Cactus Coral Area

Sharp Island West is home to Hong Kong's largest cactus coral (Pavona) area, with a coral coverage roughly the size of a football field . This site is particularly special because cactus coral is relatively rare in Hong Kong waters, and the sheer scale of the colony here is remarkable. The shallow waters make it accessible for snorkellers of all skill levels.

🪸 Ung Kong Wan (甕缸灣)

Volcanic Rock Formations Meet Coral Reefs

Ung Kong Wan sits within the volcanic rock region of the UNESCO Global Geopark, where dramatic hexagonal columns meet the sea—and the underwater world is just as spectacular. Located near Basalt Island, this sheltered bay offers excellent snorkelling conditions with a mix of hard corals, colourful reef fish, and unique volcanic rock formations visible both above and below the waterline . It's a favourite for its calm waters and rich marine biodiversity.

What to Expect on Your Snorkelling Tour

DetailInformationDurationApproximately 2.5 hours (including briefing and transport)Meeting PointSai Kung Public School (Sai Kung Town)What's IncludedSnorkel gear (mask, snorkel, fins), life jacket, guideSkill LevelBeginner-friendly—basic swimming ability recommendedMinimum Age6 years oldWhat to BringSwimwear, towel, sunscreen, water

Your professional guide will provide a safety briefing before you enter the water and remain with the group throughout the experience . All snorkelling equipment is provided, and the guide will point out the most interesting marine life and coral formations as you explore.

Why Snorkel in Hong Kong's Geopark?

Many visitors are surprised to learn that Hong Kong has vibrant coral ecosystems—and the Geopark area is home to some of the most diverse and well-preserved marine life in the region. Snorkelling here offers a unique perspective on the geological wonders: you're not just looking at 140-million-year-old volcanic rock from the surface—you're exploring the underwater world where these ancient formations meet a living, breathing marine ecosystem.

Ready to explore Hong Kong's underwater wonders? 🌊🐠

Here's a quick overview of each individual tour you can book separately:

• Four Sea Arches Volcano Sightseeing Tour (2 hrs) – HKD 480 per person. A speedboat journey through Hong Kong's UNESCO Global Geopark, showcasing towering hexagonal volcanic columns and the four largest sea arches in the East China Seas.
• Double Sea Arches Volcano Coasteering Tour (2 hrs) – HKD 580 per person. An active water adventure combining swimming, scrambling, and cliff jumps through two iconic sea arches and caves along the Geopark coastline.
• Ninepin Group Island Hopping Tour (2.5 hrs) – HKD 580 per person. A speedboat expedition to the Ninepin Islands, home to the world's densest cluster of hexagonal volcanic rock columns and dramatic sea caves.
• Guided Snorkelling Tour (various locations) – from HKD 480 per person. Explore Hong Kong's vibrant coral areas, including sites like Long Mong Wan, Kau Sai Wan, Sharp Island West, or Ung Kong Wan, depending on conditions.

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Yes, you can absolutely book the experiences separately if you prefer. All of Splitdyboat's individual tours are available as standalone bookings, giving you the flexibility to choose exactly which activities suit your group without committing to a combo package. Whether you're interested in just the Volcano Sightseeing Tour, the Coasteering Experience, the Ninepin Group Island Hopping, or the Guided Snorkelling, you can book each one on its own.

Booking separately also allows you to customize your day at your own pace. For example, you might want to spend more time snorkelling without the rush of a combined itinerary, or you might prefer to enjoy the Volcano Sightseeing Tour with your family and come back another day for the more adventurous Coasteering. It's entirely up to you.

That said, there are two things worth considering if you choose to book separately. First, the combo packages offer significant savings—up to HKD 230 per person—so if you're planning to do two activities anyway, bundling them is more budget-friendly. Second, separate bookings have their own schedules and meeting points, which means you'll need to manage the logistics and travel time between activities yourself.

In short, yes—you have the freedom to book separately. But if you're already planning to combine experiences, the combo packages offer better value and a more seamless, hassle-free day out. Either way, Splitdyboat has you covered.