Sangu river originates in the Arakan Hills of Myanmar and
enters Bangladesh near Remarki (Thanchi upazila of Bandarban district). It flows north through Thanchi,
Rowangchhari and Bandarban upazilas of Bandarban district. Then it flows west through Satkania and Banshkhali upazilas
of Chittagong district to meet the Bay of Bengal near Khankhanabad (Chittagong).
The length of the river is 295 km. The major tributaries of the river are
Chandkhali Nadi and Dolu khal. There are 7 BWDB hydrometric stations on this
river and data are available from 1965. Sangu River has its source at 21°13´N
and 92°37´E in the North Arakan Hills, which form the boundary between Arakan
and the CHITTAGONG HILL TRACTS. It follows a northerly circuitous course in the
Hill Tracts up to BANDARBAN. It enters the district from the east and flows
west across the district and finally falls into the BAY OF BENGAL at the end of
a course of 270 km (173 km within Bangladesh territory) at 22°6´N and 91°51´E
about 16.09 km south of the mouth of the KARNAFULI. The principal tributary of
the Sangu is the Dolukhal, which drains the Satkania plain. The Chand Khali
flowing through the Patiya plains also joins it on its right-bank. Further
down, it is joined by the Kumira Khali and ultimately falls into the Kutubdia
Channel. The Sangu is, therefore, a very important river in so far as it drains
off the waters of three important upazilas - PATIYA, SATKANIA and BANSHKHALI.
It has also a connection with the Karnafuli through the Chand Khali. The Sangu
is a shallow river but it becomes violent during rains with rapid currents. It
is navigable up to 48.27 km from the estuary. The Sangu gas field is located
about 50km southwest of Chittagong and stands at a depth of 10 meters the Bay
of Bengal.
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