Tam Giang Lagoon, located 15 km from Hue City, is the biggest lagoon in Southeast Asia, covering nearly 22,000 hectares. The lagoon is the meeting place of 3 big rivers, including Huong, O Lau and Bo, before they run into the sea through the Thuan An estuary.
A large, brackish, coastal lagoon, about 20 km long and up to 3 km wide, Tam Giang Lagoon supports a rich fish and invertebrate fauna, and is a major staging and wintering area for migratory waterfowl, particularly ducks and shorebirds.
To get to the lagoon, travelers can take a 30 minutes ride along O Lau River then pass through Bao Vinh ancient town and finally to Vinh Tu wharf. The most beautiful moments on the lagoon are at sunset when it turns purple.