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Khorat Plateau
(詳細はplateau in the northeastern Isan region of Thailand. The plateau forms a natural region, named after the short form of Nakhon Ratchasima, an historical stronghold controlling access to and from the area.
==Geography==
The average elevation is 200 m and it covers an area of about 155,000 km². The saucer-shaped plateau is divided by a range of hills called the Phu Phan mountains into two basins: the northern Sakhon Nakhon Basin, and the southern Khorat Basin. The plateau is tilted towards the south-east, and drained by the Mun and Chi rivers, tributaries to the Mekong that forms the north eastern boundary of the area. It is separated from Central Thailand by the Phetchabun mountain range and the Dong Phaya Yen mountains in the west, the Sankamphaeng Range in the southwest and by the Dongrek mountains in the south, all of which historically made access to the plateau difficult.
These mountains together with the Truong Son Range in the north-east catch a lot of the rainfall, so the South-West monsoon has much lower intensity than in other regions—the mean annual rainfall in Nakhon Ratchasima is about 1150 mm, compared with 1500 mm in Central Thailand. The difference between the dry and wet seasons is much greater, which makes the area less fertile for rice. The portion known as Tung Kula Rong Hai was once exceptionally arid.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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