Tam Giang and Cau Hai together form the largest lagoon system in Southeast Asia, stretching more than 70 kilometres along the coast north of Hue. The shallow, brackish waters teem with fish, shrimp and crab, and the seafood here — eaten fresh at simple waterside stalls — is some of the best in central Vietnam.
The lagoon is a working landscape. Fishermen navigate the channels in basket boats, tending nets and crab traps as they have for generations. At dawn and dusk the light over the water is extraordinary. The area sees very few foreign visitors, making it one of the most peaceful day trips from Hue. Local boats can be hired to explore the fishing villages and oyster farms along the shore — see the sunset boat tour for the classic option.