- The system of lagoon along the coast of Thua Thien Hue from the northwest-southeast: The Tam Giang Lagoon (25km), the Thuy Tu Lagoon (An Truyen, Thanh Lam, Ha Trung, Thuy Tu with total length of 33km), the Cau Hai Lagoon (22km). Tourist Attractions, What to see in Thua Thien...