Chao Phraya River

Chao Phraya River
or Me Nam River

River, Thailand.

Flowing south from the highlands on the country's northern border to the head of the Gulf of Thailand near Bangkok, it is 227 mi (365 km) long and is Thailand's principal river. It is important for the transport of the country's exports. It also forms a highly productive agricultural valley. The name strictly applies only to the river's lower course, which begins at the confluence of the Nan and Ping rivers and is 160 mi (257 km) long.

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Thai  Mae Nam Chao Phraya , also called  Maenam 
 principal river of Thailand. It flows south through the nation's fertile central plain for more than 225 miles (365 km) to the Gulf of Thailand. Thailand's capitals, past and present (Bangkok), have all been situated on its banks or those of its tributaries and distributaries, as are many other cities.

      The Chao Phraya constitutes a valuable waterway for the transport of the nation's traditional exports of teak and rice south to Bangkok, though less bulky commodities are now moved overland by road or rail. For centuries the Thai have made use of the Chao Phraya, and particularly its canal (khlong) system, for drainage, recreation, and fishing and as a source of water.

      The river's headwaters—the Ping, Wang, Yom, and Nan rivers—rise in the mountains of northern Thailand. At Nakhon Sawan, 140 miles north of Bangkok, the main river begins with the Ping-Nan confluence. Its tortuous course flows past Chai Nat (site of a government dam and irrigation scheme), Sing Buri, Ang Thong, Nonthaburi, and Bangkok to its mouth at Samut Prakan. From its formation at Nakhon Sawan, the river falls less than 80 feet (24 m) in its journey to the sea.

      The Chao Phraya system drains 61,807 square miles (160,079 square km) and is the basis of several major irrigation projects. The river's basin is a low, filled arm of the Gulf of Thailand that is seamed with numerous distributaries. Near Chai Nat a distributary—the Nakhon Chai Si River—branches to the west and parallels the mother stream to the gulf at Samut Sakhon, 25 miles (40 km) west of the main mouth. The main stream bifurcates and reunites several times. Below Chai Nat the Noi River branches westward and rejoins the Chao Phraya at Sam Khok. The Lop Buri River branches eastward and, before returning to the main stream, flows past the cities of Lop Buri and Phra Nakhon Si Ayutthaya; at the latter it receives a great eastern tributary—the Pa Sak River—from the Phetchabun Mountains of the northeast.

      Tides run up the meandering Chao Phraya to Phra Nakhon Si Ayutthaya. The delta plain around Bangkok is seldom more than 7 feet (2 m) above sea level, and annual flooding brings rich alluvium to the rice fields. In the delta, the Chao Phraya, the Mae Klong on the west, and the Bang Pakong on the east are linked by a network of canals.

      The 25-mile course below Bangkok is lined with wharves and other harbour installations. The mouth of the deepwater channel requires frequent dredging and cannot accommodate vessels larger than 10,000 tons.

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Universalium. 2010.

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