Co Thach is not a swimming beach. Get that expectation out of your head now. People come here for one thing: a seasonal carpet of bright green moss draped over hundreds of dark volcanic rocks along the shoreline, creating something that looks almost artificial in its intensity. It's a photographer's playground and a genuinely strange landscape — and it only looks this way for about six weeks each year.
What Co Thach Is
Co Thach (literally "ancient stone") sits in Binh Thanh commune, Tuy Phong district, along the coast of what is now Lam Dong province. The beach stretches roughly 3 km, with the southern section dominated by clusters of igneous rock formations — some rounded smooth, others jagged and layered. During the northeast monsoon season, wave spray and humidity feed a layer of sea moss that coats these rocks in vivid green. The rest of the year, the rocks are bare and dark grey, and honestly not that remarkable.
There's a small pagoda — Co Thach Pagoda — set into the hillside above the beach, dating to the early 20th century. It's modest but worth a five-minute walk up for the coastal view.
Why Travelers Go
The moss. That's the honest answer. From mid-January through early March (peaking in February), the rock formations turn electric green. The contrast between dark stone, green moss, white surf, and blue sky is genuinely unusual — you won't find this combination elsewhere along Vietnam (베트남 / 越南 / ベトナム)'s coast. Photographers, both amateur and professional, treat it as an annual pilgrimage. Outside moss season, Co Thach is a quiet, windswept stretch of coast with minimal tourism infrastructure and not much reason to make a special trip.
Best Time to Visit
The moss appears from roughly mid-January to early March, depending on rainfall and temperature. Peak green is typically the last two weeks of February. Arrive at sunrise — between 5:15 and 5:45 AM — for the best light and lowest tides, which expose more rock surface. By 8 AM, the light flattens and tour groups from Phan Thiet start arriving.
Avoid weekends during Tet (뗏 (베트남 설날) / 越南春节 / テト (ベトナム旧正月)) if possible. The beach gets crowded with domestic visitors during the lunar new year holiday, and you'll be competing for space among the rocks.
Outside January–March: the beach is windy, the rocks are bare, and accommodation options thin out. April through December is not worth a detour.
How to Get There
The nearest major hub is Phan Thiet, about 90 km to the southwest along the QL1A highway.
- Motorbike from Phan Thiet: 90 km, roughly 1.5–2 hours depending on traffic through Tuy Phong town. Rental bikes in Phan Thiet or Mui Ne (무이네 / 美奈 / ムイネー) run 150,000–200,000 VND/day for a semi-auto.
- Taxi/private car from Phan Thiet: 800,000–1,000,000 VND one way. Grab cars are unreliable for the return trip — you may not find a driver in the area.
- From Saigon by bus: Take a Phan Thiet-bound bus from Mien Dong station (140,000–180,000 VND, 4 hours), then arrange local transport. Some buses on the Saigon–Phan Rang route pass through Lien Huong town, which is only 8 km from the beach — ask the driver.
- From Da Lat: About 200 km via QL28. A scenic but long ride (5+ hours by motorbike). Not practical as a day trip.
Photo by Tuấn Vũ on Pexels
What to Do
Walk the Rock Formations at Low Tide
The mossy rocks are concentrated in the southern section, near the pagoda. Low tide exposes tidal pools between the formations. Wear shoes with grip — wet moss on rock is exactly as slippery as it sounds. Flip-flops are a bad idea here.
Sunrise Photography
The best compositions face east, with rocks in the foreground and the sun rising over the water. A wide-angle lens and a low tripod work well. Arrive 30 minutes before sunrise to scout positions in the dark — bring a headlamp.
Visit Co Thach Pagoda
A 10-minute walk up the hill from the southern end of the beach. The pagoda itself is small and unassuming, but the elevated view of the rock-studded coastline below is the real draw. Free entry.
Explore Tidal Pools
Between the larger rock clusters, shallow pools harbor small crabs, sea urchins, and occasionally juvenile fish. Kids love this. Don't remove anything — locals are protective of the ecosystem.
Drive North to Vinh Hao
About 15 km north, Vinh Hao has natural mineral springs and a quieter stretch of coast. The mineral water bottled here is sold nationwide — you can visit the source spring area, though it's not a formal tourist attraction.
Where to Eat Nearby
Co Thach itself has a handful of seafood shacks along the access road, serving whatever was caught that morning. Expect grilled fish, steamed clams, and "banh canh" with crab — the thick tapioca noodle soup is a Binh Thuan staple and good fuel after an early sunrise outing. A seafood meal for two runs 200,000–350,000 VND.
In Lien Huong town (8 km south), look for "banh xeo" — the southern-style crispy crepes here use fresh shrimp and are served with a mountain of herbs. Basic but satisfying.
Where to Stay
Accommodation near Co Thach is limited and basic:
- Guesthouses near the beach: 200,000–400,000 VND/night. Simple rooms, fans or weak AC, cold water showers. Don't expect much.
- Homestays in Binh Thanh: A few family-run places have appeared in recent years, 300,000–500,000 VND. Cleaner than the beach guesthouses but further from the rocks.
- Phan Thiet / Mui Ne hotels: If you want comfort, base yourself in Mui Ne (100+ km round trip) and leave very early. Mid-range hotels there run 600,000–1,200,000 VND.
Photo by Loifotos on Pexels
Practical Tips
- Footwear matters. Rubber-soled shoes or water shoes. The moss is slippery and the rocks have sharp edges. Every visit, someone slips and cuts a hand or knee.
- Bring water and snacks. There's one drink vendor near the parking area, and she may not be there at 5 AM.
- Check tide tables. Low tide exposes the best rock formations. High tide submerges most of them and eliminates the photo opportunities.
- Cash only. No ATMs at the beach. Nearest ATM is in Lien Huong town.
Mistakes to Avoid
- Coming outside moss season and wondering why the beach looks unremarkable. Check the dates. February is your window.
- Arriving midday. The light is harsh, the tide is often high, and tour buses have deposited crowds onto the rocks.
- Wearing flip-flops on the rocks. You will slip. It's not a question of if.
- Not bringing a jacket. The coast here catches strong northeast winds in January–February. Mornings before sunrise are genuinely cold by Vietnamese standards (18–22°C with wind chill).
- Expecting resort infrastructure. This is a rural fishing coast with minimal tourism development. That's part of its character, but plan accordingly.
Practical Notes
Co Thach works best as a sunrise stop on a longer coastal drive between Mui Ne and Phan Rang, or as an overnight from Phan Thiet during moss season. Outside February, redirect your time to Mui Ne's sand dunes or the coast near Ninh Thuan instead. Keep expectations calibrated: it's a seasonal natural phenomenon on a rural beach, not a developed attraction.
Last updated · May 19, 2026 · independently researched, never sponsored.
