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A
large, brackish, coastal lagoon, about 20 km
long and up to three km wide. The lagoon extends
in a northwest-southeast direction parallel to
the coast, and is separated from the sea by a
sandy ridge formed by coastal deposition. The
northern end of the lagoon is the mouth of O
Loan River; both the river and the lagoon open
into the sea at the Thuan An and Tu Hien
channels.
Thua Thien-Hue Province plain along the sea
coast has many lagoons, such as those of Tam
Giang, Thuy Tu, Lap An, into them are converged
the water of almost all the rivers of the
province of Thua Thien Hue before going to the
sea, through the mouths of Thuan An, Tu Hien, or
through the great lagoon of Lang Co.
Tam Giang and Cau Hai are the 2 biggest lagoons
with fresh water, the 2 most representative
lagoons in Vietnam with a length of 70km for the
whole of the two, they form an ideal habitant
for many sea species all along the province.
The lagoon supports a major fishery which is
important not only as a protein source for the
local communities, but also for export. The
annual production of finfish alone is estimated
at 3,600 metric tonnes. The lagoon also has
considerable potential for outdoor recreation
and tourism.
A very important area for wildlife. The lagoon
supports a rich fish and invertebrate fauna, and
is a major staging and wintering area for
migratory waterfowl, particularly ducks and
shorebirds.
Tropical monsoonal climate with a rainy season
from August to December; the heaviest rainfall
occurs in October and November. The mean January
temperature is 20.1°C, and the mean June
temperature 29.2°C.
Yearly thousands tons of sea products are
brought on here (fish, shrimps and others). In
the recent years, the cultivation and raising of
sea products, mainly the raising of shrimps and
cultivation of "gracilaria" has developed in
this zone of lagoons
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