January
23.2°C ~ 74°F
19 days of rain
Crowds: Quiet
Hang Cau (Cau Cave)
A sea cave carved into volcanic rock on the island's coast, open to the waves.
- Location
- Ly Son
- Time needed
- 30 – 60 min
- Entry fee
- No entrance fee found in…
- Best months
- Mar – Aug
Overview
Hang Cau is a cave formed by waves in the island's volcanic rock, with clear water at its mouth. It is one of the best-known coastal spots on Ly Son and a favourite for swimming and photos.
The rocks can be slippery, and waves can be strong, so keep to the marked paths and avoid rough-sea days. A ticket may be required; ask at the site for the current price. Plan 30 to 60 minutes.
Highlights
- See the sea cave carved into the rock
- Swim in the clear water
- Take photos at the cave mouth
Visitor information
| Opening hours | Daytime; best in the morning or late afternoon |
|---|---|
| Entry fee | No entrance fee found in guides checked for 2025 – 2026. Ask on the island. |
| Time needed | 30 – 60 min |
| Best time of day | Early morning or late afternoon |
| Good for | Photographers, couples |
| Accessibility | Uneven rock and steps |
| Facilities | Cafes and parking nearby |
Prices and hours can change. Check the official source before you go.
Best time to visit
Weather in Ly Son by month.
February
23.1°C ~ 74°F
11 days of rain
Crowds: Moderate
March
24.4°C ~ 76°F
7 days of rain
Crowds: Moderate
April
25.8°C ~ 78°F
5 days of rain
Crowds: Busy
May
27.8°C ~ 82°F
8 days of rain
Crowds: Busy
June
28.9°C ~ 84°F
5 days of rain
Crowds: Busy
July
28.8°C ~ 84°F
10 days of rain
Crowds: Busy
August
29.1°C ~ 84°F
9 days of rain
Crowds: Busy
September
28.2°C ~ 83°F
19 days of rain
Crowds: Quiet
October
26.8°C ~ 80°F
26 days of rain
Crowds: Quiet
November
25.7°C ~ 78°F
24 days of rain
Crowds: Quiet
December
24.1°C ~ 75°F
25 days of rain
Crowds: Quiet
How to get there
- From Ly Son centre
On the coast of Ly Son. Rent a motorbike (about 120,000 – 150,000 VND per day) or take a taxi.
- Hang Cau (Cau Cave)
Tips before you go
- Keep to the marked paths
- Avoid rough-sea days
- Wear shoes with grip
- Go in the morning or late afternoon
Location
An Hai, Ly Son
More attractions in Ly Son
FAQs
Can I swim at Hang Cau?
Yes in calm weather, but waves can be strong.
Is it free?
Ask at the site.
How long do I need?
About 30 – 60 minutes.