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The Tam Giang-Cau Hai (TGCH) Lagoon is located in the central province of Thua Thien Hue in Viet Nam. It is the largest lagoon system in southeast Asia with nearly 70 km length along the coast and about 22,000 ha of water surface.

The lagoon system consists of several smaller lagoons, namely Tam Giang, Thanh Lam, Sam, Ha Trung, Thuy Tu, and Cau Hai from the north to the south along the coast. The lagoon has two channels (Thuan An and Tu Hien) connecting itself to the sea. The lagoon system is also linked to two basins with four main rivers flowing into the lagoon (O Lau, Bo, Huong, and Truoi rivers).

Estimated 300,000-350,000 people are fully or partly depend their livelihoods on the lagoon resources. This is nearly third of the population in the province.