Nonthaburi (Thai: นนทบุรี, pronounced [nōn.tʰá(ʔ).bū.rīː]) is the principal city of the district and province of the same name in Thailand.
On 15 February 1936, Nonthaburi town municipality (thesaban mueang) was established, which only covered Suan Yai subdistrict (tambon), just 2.5 km2 (0.97 sq mi).
On 25 September 1995, Nonthaburi was upgraded to city municipality (thesaban nakhon) by enlargement of the city with four more subdistricts, Talat Khwan (8.2 km2 [3.2 sq mi]), Bang Khen (9.0 km2 [3.5 sq mi]), Bang Kraso (11.2 km2 [4.3 sq mi]) and Tha Sai (8.0 km2 [3.1 sq mi]), covering a total of 38.9 km2 (15.0 sq mi). As of 31 December 2019, it has a registered population of 254,375, making it the most populous city municipality in Thailand (excluding Bangkok). There are 93 communities (chumchon), although not directly chosen by the local citizens, which provides advice and recommendations to local administrative organizations. Due to its proximity to Bangkok, the city is considered a suburb of Bangkok, a part of the Bangkok Metropolitan Region, or Greater Bangkok.
Nonthaburi is served by public transport systems including the Bangkok Mass Transit Authority bus system, the Chao Phraya Express Boat, and the MRT Purple Line, inaugurated in 2016.
Nonthaburi is known for its temple and market such as Wat Chaloem Phra Kiat, Wat Chomphuwek, Wat Chotikaram, Wat Khema Phirataram, Wat Prasat, Wat Sangkhathan and so on.
The island of Ko Kret (Koh Kred), floating in the Chao Phraya river, is easily accessed from Bangkok.
There are few accommodation options in Nonthaburi. This is largely due to the lack of foreign tourists, as well as its proximity to Bangkok.
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Due to its close proximity to Bangkok the city is a suburb of the national capital, and is generally considered a part of Greater Bangkok - had it not been for the signposts you'd hardly notice where one ends and the other begins. Officially, however, Nonthaburi is one of the five neighbouring provinces of Bangkok. Covering an area of 622 square kilometres and separated into 2 parts by the Chao Phraya River, Nonthaburi is administratively divided into six districts: Mueang Nonthaburi, Pak Kret, Bang Kruai, Bang Yai, Bang Bua Thong and Sai Noi.