Choeng Mon · Beaches
Tong Sai Bay
Thong Sai Beach
One of the smallest beaches on the island - about 100 metres of sand on the northeast coast, backed by greenery. Good swimming and snorkeling, but the sea gets deep quickly, so children need close supervision. Quiet and isolated. Free public sand; best for confident swimmers on calm days.
- Free
- Choeng Mon
- Checked 25 Sept
Insider tips
- The water gets deep quickly - this is a swimmers' beach, not a toddlers' beach.
- Watch the sharp rocks at both ends.
- Bring your own food and water - almost nothing is sold nearby.
- Longtail boats can be hired to explore the coast from here.
The story
Tong Sai Bay (Thong Sai) is one of the smallest beaches on Koh Samui - only about 100 metres of sand on the northeast coast, set below green hills and largely isolated from the busier tourist areas. Swimming and snorkeling are good here, but with an important caveat: the seabed drops off quickly from the shoreline, so it gets deep fast - guides recommend that young children are supervised at all times. There are some sharp rocks at both ends of the beach.
Read moreShow less
In peak season a few beach chairs and kayaks are available for rent; outside that, there is very little - no shops or food options of note nearby. The beach is public as always, though most of the land behind it belongs to a resort. It suits confident swimmers looking for a beautiful, quiet cove rather than families with small children.
Reach it by scooter or taxi on the northeast roads.
Good to know
- Open 24 hours
- Free
- Calm dry-season days; morning for quiet
Plan a visit
Free route: you go by your own scooter, car or on foot and we work out the order. Private tour: a local driver picks you up and takes you.
Checked 25 Sept 2026 · 4 sources
Sources and last check
- Last checked
- 25 Sept 2026
- What was checked
- Details checked 25 Sept 2026
- Next check due
- September 2027
Official sources
No official source published yet for this page.
Plus 4 other references and local research.
