Tam Giang - Cau Hai Lagoon system in Hue City is the largest brackish water ecosystem in Southeast Asia, stretching 68 km, covering a total water surface area of approximately 216 km2. The area is renowned for its poetic sunsets, rich biodiversity, and serves as a popular destination for eco-tourism, photography, and enjoying local seafood specialties.

In 2000, in the short piece entitled “Hue Diary,” written when he returned for the first Hue Festival, musician Trinh Cong Son wrote, “When you have a place to return, or to visit from time to time, you are very fortunate. There, you have a river, a mountain, and you can find again your old friends whose hair used to be black has now turned grey. You might suddenly meet a Hue girl on the street and ask her, ‘Is there anything new in Hue now?’ And immediately, or perhaps by chance, she will recite the two lines from a poem by Bui Giang: “Da thua xu Hue bay gio/ Van con nui Ngu ben bo song Huong” (“Yes, sir, Hue now/ Still has Ngu Mount by the Huong river…”)

The Tam Giang - Cau Hai lagoon system of Hue City stretches in the Northwest - Southeast direction along the coast, with a length of 68 km and a total surface area of 216 km². It comprises three interconnected lagoons: Tam Giang, Thuy Tu, and Cau Hai. With aquatic flora and fauna considered among the richest in Southeast Asia, this ecosystem has sustained generations of local residents.

Spanning a total water surface area of more than 210 km², Tam Giang - Cau Hai lagoon system,consisting of three main lagoons: Tam Giang, Thuy Tu, and Cau Hai, is often praised as a natural masterpiece bestowed upon Hue. The Tam Giang - Cau Hai lagoon system connects to the East Sea via the Thuan An inlet (Tam Giang lagoon) and the Tu Hien inlet (Cau Hai lagoon). It is the largest brackish lagoon system in Vietnam as well as all of Southeast Asia with an incredibly rich and diverse ecosystem.

In the radiant dawn of the lagoon region, travelers from afar sip rich, flavorful coffee while enjoying the vast, beautiful scenery of rippling waters. This fresh experience has been developed into a tourist attraction, creating a unique highlight for visitors to Tam Giang – Cau Hai Lagoon.

As a “pillar of the community” with over 40 years of experience, Nguyen Ha (Giang Hai, Phu Loc) is not only revered for his deft hands but also respected by fellow fishermen for his dedication to the craft of net weaving and his journeys on the open sea.

After waiting for nearly 2 hours on the beach of Giang Hai Commune (Phu Loc), Mr. Thuan started to collect the net. Ironically, the net only had a few small fish when he pulled it up. Meanwhile, just a few hundred meters away, Mr. Hai's net was full of fish waiting to be picked.

Within the framework of the implementation of the national-level independent project on “Studying and evaluating the current status of the avifauna, and proposing solutions for management and conservation of bird species in coastal lagoon area in Central Vietnam”, which is presided over by the Central Coast Natural History Museum, the Provincial Department of Science and Technology, and implemented by Dr. Ho Thang, the project leader, the research team has recorded the glossy ibis (Plegadis falcinellus) for the first time in the O Lau estuary of Tam Giang - Cau Hai lagoon.

At 8 p.m. Tram and her friends were present on the coast in Giang Hai (Phu Loc). They thought they were early, but in the dim light of flashlights, they saw tens of people already there choosing the best herrings.

Diving right at the foot of the coastal rock embankment in Giang Hai commune (Phu Loc), precisely at the moment when the waves had not yet reached, Mr. Hung extended his hands into every crevice. In just a moment, he firmly held in his hand a stone crab (Gecarcoidea) with its two large claws.