What is Dam O Loan lagoon and what can I do there?
Dam O Loan is a 1,570-hectare lagoon in Tuy An, 22km north of Tuy Hoa. Brackish water makes it ideal for oysters. The main activity: take a boat to floating seafood platforms and eat what came up that morning — oysters, clams, crab, fish. Boat ferry: 50,000–100,000 VND per person return.
Dam O Loan sits in the low ground between the hills and the sea at the northern end of Tuy An district. From above it looks like the ocean made an error — a wide pocket of water reaching inland, surrounded by hills on three sides, open to the sea through a narrow inlet. That inlet regulates everything: the mix of saltwater and fresh river water flowing in from the surrounding hills creates conditions that the oysters here have thrived in for centuries.
The lagoon itself
The lagoon covers about 1,570 hectares. The water is shallow — average depth around two to four meters — and brackish. Fishing boats and aquaculture platforms are scattered across the surface. Along the shores, egrets work the shallows. In the evening when the light goes flat, the whole thing looks like a landscape painting done with limited colors: grey-green water, dark hills, white birds.
You don’t need to do anything in particular at Dam O Loan. Walking the shore is pleasant. But most people come to eat.
Getting to the floating platforms
From the shore near Chi Thanh town, small wooden boats ferry visitors out to the floating restaurants — platforms built on bamboo or wooden frames, moored in the middle of the lagoon. The boat ride is two to five minutes. Cost for the ferry: 50,000–100,000 VND per person return, sometimes included in the meal cost.
The restaurants on these platforms are simple: a roof, plastic chairs, a kitchen, and whatever came out of the lagoon that morning. You order at a table and the food arrives fast because it was alive ten minutes ago.
What to eat
Hau O Loan (O Loan oysters): The reason to come. These oysters are small by international standards but intensely flavored — the brackish water concentrates minerals in the meat. They’re served raw (con song) with lime and chili salt, or grilled on the half shell with scallion oil and crushed peanuts (nuong mo hanh). A kilogram runs 100,000–200,000 VND. Order at least half a kilo.
Ngheu (clams): Steamed with lemongrass, or stir-fried with garlic. Good but less distinctive than the oysters.
Cua (crab): Local freshwater and brackish crabs, steamed or cooked in tamarind sauce. Ask what’s available — not always on the menu but often obtainable.
Ca nuong (grilled fish): Whole fish caught in the lagoon, grilled over charcoal. Less remarkable than the shellfish but worth ordering if the oysters are sold out.
When to go
Oysters peak from October to March — the cooler water makes the meat sweeter and firmer. They’re available year-round but at their best in the dry season. The lagoon itself is pleasant to visit any time from January to August; avoid the September to December storm season when access roads can flood.
How it fits into a day
Dam O Loan is a natural waypoint on the northern day loop from Tuy Hoa:
- Leave Tuy Hoa by 7am
- Dam O Loan for breakfast or brunch (9–11am)
- Continue north to Ganh Da Dia (40 minutes further)
- Optional: Hon Yen if tide timing allows
- Return south in the afternoon