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.

Just about 30 kilometers away, Quang Loi Lagoon is not far from the center of Hue City. It's located in Quang Loi Commune, Quang Dien District - a low-lying area rich in cultural identity. Covering approximately 800 hectares, the lagoon is part of the Tam Giang lagoon system. Following the flow of the waters, the lives of the people here are closely tied to the water as they engage in simple and humble fishing activities.

Tam Giang - Cau Hai lagoon system is a world-class brackish water area. It is the largest in Southeast Asia, with special value in biological resources and countless gripping things in history and culture.... This area is seen as a "precious biological gem" that nature has bestowed on the ancient capital. With what existent, is it necessary to build an exhibition space or a museum for the Tam Giang - Cau Hai lagoon system?

Not only famous for its important and beautiful lagoon system in Vietnam, Tam Giang - Cau Hai also holds great potential for tourism development.

Being 10km away to the Southeast of Hue City Center, Quang Loi Lagoon is one of the lagoons belonging to Tam Giang lagoon system (the biggest brackish water lagoon in Southeast Asia).

Tam Giang brackish water lagoon system is the Southeast Asia's largest, located 30 km from Hue City. The lush mangrove forest not only creates conservation areas for aquatic resources, helping the Tam Giang lagoon to put on a new color, but also protects the habitat from the impact of climate change, creating more livelihoods for local people, from fishing to community tourism.