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Tam Giang lagoon, Phu Vang district, Hue, Vietnam

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Viet Nam, Hue, Phu Vang district

Tam Giang Lagoon is the largest brackish water lagoon system in Southeast Asia, located in Thua Thien Hue Province, Vietnam. It is renowned for its wild, tranquil beauty and serves as the convergence point of three major rivers – the Huong, Bo, and O Lau – before they flow into the sea. The lagoon supports a highly diverse and rich ecosystem.

One of my favorite fish found here is Oreochromis niloticus, a species that is both easy to find and remarkably beautiful.

Submitted by
Nhan Nguyen Bao
Approved by
Heiko Blessin, Heok Hee Ng & Greg Martin
GPS
16.5470428, 107.6317749
Geographical region
Southeastern Asia
Drainage Basin
South China Sea
River catchment
Huong River (Sông Hương), Bo River (Sông Bồ) and O Lau River (Sông Ô Lâu)
Water body type
Lagoon
Water body name
Tam Giang lagoon
Water body part
Outflow
Water body course
Lower course
Water body: tributary of
River
Tributary name
Huong River, Bo River and O Lau River

Videos above and below water


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Water Chemistry

Water information

Water type
brackish-water
Water color
Mixed water
Water transparency
Low
Concentration of sediments
No
Water temperature
26 °C
Water flow/curent

Chemical parameters

pH
7.5
Conductivity
GH
dGH
KH
dKH
Dissolved Oxygen

Substrate in nature

Sand
Beige
Pebble/Gravel
None
Stone
Mixed
Stone form
Irregular
Silt/Mud
Black
Leaves
Few
Driftwood
Few
Submerged terrestrial vegetation
Yes

Aquatic Biotope

Date of collecting
17/06/2025
Collecting area
Open water
Water depth
1,0m
Air temperature
30 °C
Sunlight
Full sun

Environment

Environment
Human settlements
Human settlements
Dispersed
Surrounding area

Tam Giang Lagoon, located in Phu Vang District, Thua Thien Hue Province, Vietnam, is one of the most renowned coastal lagoons in the country. Known for its ecotourism potential, the lagoon boasts a rich and diverse mangrove ecosystem.

During the rainy season, water from major rivers – including the Huong, Bo, and O Lau Rivers – flows into the lagoon before eventually reaching the sea. This natural circulation creates a dynamic and biologically diverse environment, making Tam Giang not only a vital ecological region but also a captivating destination for visitors.

Underwater landscape

The waters in this area are rich in biodiversity, supporting a wide variety of aquatic plants and animals. Submerged grasses blanket the lagoon, creating a vibrant and picturesque habitat. The presence of green algae further enhances the ecosystem by contributing to water quality and offering a safe, healthy environment in which fish can thrive.

Fish list:

  • Oreochromis niloticus (Cichlidae)

Crustacean list:

  • Perisesarma bidens (Sesarmidae)

Mollusc list:

  • Vittina natalensis (Neritidae)

Terrestrial vegetation list:

  • Cyperus rotundus (Cyperaceae)
Threats to ecology

The waters in this area are rich in biodiversity, supporting a wide variety of aquatic plants and animals. Submerged grasses blanket the lagoon, creating a vibrant and picturesque habitat. The presence of green algae further enhances the ecosystem by contributing to water quality and offering a safe, healthy environment in which fish can thrive.

Riparian zone

Trees near the aquatic habitat
Many -

Bibliography


Sitography

→ Wikipedia.org
→

Comment by the expert

Heok Hee Ng: BIN description states that this habitat is high in biodiversity, yet only one fish species (and an alien invasive one at that) is listed. This cannot be the case.

Greg Martin: The research could have been more thorough — it would have been important to note that Nile Tilapia are considered a pest species in these waters.