Where is Tam Giang Lagoon in Hue? This is a lagoon system of Thua Thien Hue province, with an area of ​​about 52km2, known as the largest brackish water lagoon in Southeast Asia. The map of Tam Giang Lagoon in Hue is spread over the territory of 4 districts: Phong Dien, Quang Dien, Huong Tra and Phu Vang of Thua Thien Hue province.