Regions of Thailand

Thailand is variably divided into different sets of regions, the most notable of which are the six-region grouping used in geographic studies, and the four-region grouping consistent with the Monthon administrative regional grouping system formerly used by the Ministry of Interior. These regions are the largest subdivisions of the country.

In contrast to the administrative divisions of the Provinces of Thailand, the regions no longer have an administrative character, but are used for geographical, statistical, geological, meteorological or touristic purposes.

A six-region system is commonly used for geographical and scientific purposes. This system dates to 1935. It was formalised in 1977 by the National Geographical Committee, which was appointed by the National Research Council. It divides the country into the following regions:

The four-region system, used in some administrative and statistical contexts, and also as a loose cultural grouping, includes the western and eastern regions within the central region, while grouping the provinces of Sukhothai, Phitsanulok, Phichit, Kamphaeng Phet, Phetchabun, Nakhon Sawan and Uthai Thani in the northern region. This is also the regional system most commonly used on national television, when discussing the weather or regional events. It divides the country into the following regions:

The Thai Meteorological Department divides the country into six regions for meteorological purposes. It differs from the four-region system in that the East is regarded as a separate region, the South is divided into east and west coasts, and Nakhon Sawan and Uthai Thani are grouped in the central region.

The Tourism Authority of Thailand (TAT) divides the country into five regions for tourism purposes.

The TAT division essentially follows the four region system in terms of defining the boundaries between the Northern and Central region, and the Six region system in terms of defining the Eastern from the Central regions.

...
Wikipedia