Jump from a speedboat into ancient lava caves and swim beneath bell-shaped sea arches in Hong Kong’s UNESCO Global Geopark. This short, guided coasteering tour highlights hexagonal basalt columns and offers close-up geology with safety gear included.
More ways to explore the area's outdoor wonders
The day begins at a bright, bustling pier in Sai Kung, where the speedboat cuts through teal water and spits spray across your face. In minutes the skyline of town falls away and the Ung Kong Group’s volcanic coastline rises: exposed hexagonal columns and bell-shaped arches sculpted by ancient lava and relentless waves.
Difficulty
moderate
Duration
2 hours
Fitness Level
Comfortable with short swims and basic scrambling; good balance and core strength helpful
Wildlife
History
The Ung Kong Group’s columns formed during Miocene-Pliocene volcanic activity; some cave walls retain marks from mid-20th-century military exercises.
Conservation
Operators emphasize small group sizes and ‘pack it in, pack it out’ practices; avoid touching delicate rock formations and marine life to prevent damage.
Reserve your spot on the Geopark Double Sea Arches Volcano Coasteering Tour today and enjoy a trusted, highly rated experience designed to help you make the most of your adventure.
Bring aqua shoes
Wear snug, closed-toe water shoes with good tread to scramble on wet volcanic rock without slipping.
Know your swimming level
Be honest about open-water swimming ability—guides provide jackets but you’ll need to swim short stretches between boat and cave.
Protect electronics
Use a waterproof pouch for cameras and phones; saltwater and sharp rock edges are unforgiving.
Timing matters
Book morning departures for calmer seas and better light in the caves for photography.
Aqua shoes
Protects feet on sharp, slippery basalt and gives traction during scrambles.
summer
Swimsuit and quick-dry layer
Wear under your wetsuit or life jacket for efficient swimming and quick change after the tour.
summer
Waterproof phone case
Keeps electronics dry for photos inside caves and during boat transfers.
Reef-safe sunscreen
Protects skin and reduces harm to marine life in a sensitive geopark.
summer