Perfume River Estuary

The Perfume River flows past Huế into the Tam Giang lagoon before reaching the sea at Thuận An. A long sandy barrier separates the lagoon from the open coast, leaving narrow entrances for river water and tides. A great flood in 1404 opened an inlet near Hòa Duân; the shifting passage between the lagoon and the sea has long been important to the country around Huế.