Boriwen were subdivisions of three of the larger Thai monthon

Monthon

A monthon |]], literally "circle") was a country subdivision of Thailand in the beginning of the 20th century. The Thai word 'monthon' is a translation of the word Mandala. These were created as a part of the thesaphiban bureaucratic administrative system, introduced by Prince Damrong Rajanubhab...

. Several mueang

Mueang

Mueang were historical semi-independent city-states or principalities in present-day Thailand, Laos, parts of northern Vietnam and the Shan State of Myanmar. Smaller Mueang were subordinate to more powerful neighboring Mueang, which in turn were subordinate to the central king, as described in...

were grouped together into one boriwen. In 1908 the boriwen were renamed to changwat, which became the name of provinces countrywide in 1916.

The monthon with between three to five boriwen were Phayap, Udon Thani and Isan. Each boriwen was administrated by a commissioner (khaluang boriwen, ข้าหลวงบริเวณ). The administrative headquarters of the boriwen were located in the provincial town listed first:

• Monthon Phayap
  • Boriwen Northern Chiangmai: Chiang Rai
    Chiang Rai
    -Demographics:Official Population count: According to the Thailand National Statistical Office, as of September 2010, Chiang Rai municipal district has a population of 199,699...
    
    , Chiang Saen, Papao, Nongkhwang, and Fang
  • Boriwen Western Chiangmai: Mae Hong Son
    Mae Hong Son
    Mae Hong Son ) is a town in north west Thailand, capital of the Mae Hong Son Province. It is located in the Shan Hills, near the border with Burma along the banks of the river Pai...
    
    , Yuam, Khun Yuam, and Pai
  • Boriwen Northern Nan: Chiangkhong, Thoeng, Chiangkham, Chianglaeng, Chianglom, Chianghon (Khop and Kutsawadi were seceded to France in 1904)
• Monthon Udon Thani
  • Boriwen Makkhaeng: Ban Makkhaeng (Udonthani), Nongkhai, Nonglahan, Kumphawapi, Kamutthasai, Phonphisai, and Rattanawapi
  • Boriwen Phachi: Khonkaen, Chonnabot, and Phuwiang
  • Boriwen That Phanom: Nakhon Phanom
    Nakhon Phanom
    Nakhon Phanom is a town in northeastern Thailand, capital of the Nakhon Phanom Province. The town covers the whole tambon Nai Mueang and Nong Saeng and parts of tambon At Samat and Nong Yat, all of Mueang Nakhon Phanom district...
    
    , Chaiburi, Tha Uthen and Mukdahan
  • Boriwen Sakon: Sakon Nakhon
    Sakon Nakhon
    Sakon Nakhon is a town in Thailand within the Isan region, and capital city of the Sakon Nakhon Province, with a population of approximately 76,000. It has a regional airport in the north, Sakon Nakhon Airport. During World War II, the town became a haven for Free Thais, and a base for Communist...
    
    
  • Boriwen Nam Huang: Loei
    Loei
    Loei is a town in the north-east of Thailand. In 2005, it had a population of 22,677. Loei covers the whole tambon Kut Pong of Mueang Loei district.Loei is the capital of the Loei Province.- References :...
    
    , Kaen Thao, Bo Tha
• Monthon Isan
  • Boriwen Ubon: Ubon Ratchathani
    Ubon Ratchathani
    Ubon Ratchathani is a city on the Mun River in the south-east of the Isan region of Thailand. It is known as Ubon for short. The name means "Royal Lotus City." The provincial seal features a pond with a lotus flower and leaves in a circular frame. Ubon is the administrative centre of Ubon...
    
    , Khemmarat, Yasothon
  • Boriwen Champassak (Bassac): Champassak (Bassac)
  • Boriwen Khukhan: Khukhan, Sisaket, and Det-udom
  • Boriwen Surin: Surin
    Surin, Thailand
    Surin is a town in Thailand, capital of Surin province. It is the site of the annual Surin Elephant Round-up. Surin has many farangs living within its Centre and Suburbs.-Etymology:...
    
    , and Sangkha
  • Boriwen Roi-et: Roi Et
    Roi Et
    Roi Et is a town in Northeastern Thailand, capital of the Roi Et Province. It covers the whole tambon Nai Mueang of Mueang Roi Et district. As of 2006 it has a population of 34,229....
    
    , Mahasarakham, Kalasin, Kammalasai, Suwannaphum