King Prasat Thong ordered the digging of a canal as a shortcut from the south of Wat Thai Muang to Wat Khema because the old waterway flowed into Om River to Bang Yai then to Bang Kruai Canal next to Wat Chalo before ending in front of Wat Khema.

After the new shortcut was completed, the Chao Phraya River changed its flow into the new route that remains today. In 1665, King Narai the Great noticed that the new route gave enemies too much proximity to the capital. Therefore, he ordered that a fortress be built at the mouth of Om River and relocated Nonthaburi to this area. A city shrine still stands there.

Later during the reign of King Rama IV of the Rattanakosin period, he ordered the town moved to the mouth of Bang Su Canal in Ban Talat Khwan. King Rama V then had the provincial hall built there on the left bank of the Chao Phraya River. In 1928, the hall was moved to Ratchawitthayalai, Ban Bang Khwan, Tambon Bang Tanao Si. It is now the Training Division of the Ministry of Interior on Pracha Rat 1 Road, Amphoe Muang, on the bank of the Chao Phraya River. The building is of European architecture decorated with patterned woodwork. The Fine Arts Department has registered it as an historical site. The provincial hall is now on Rattanathibet Road.

How to get there
Boat
Take a Tha Chang-Bangkok Noi-Bang Yai ferry line from Chang Pier. It operates from 06.30 to 23.00 hrs. and leaves from the pier every 30 minutes. The best time for the visitors to ride a ferry is from 08.30 to 15.30 hrs.

Car
From Phra Nang Klao Bridge turn left to Bang Kruai for 17 kilometres at Bang Bua Thong junction, turn right to Nonthaburi District Office at Wat Chalo, continue driving for 500 metres. Wat Bang O will be found on the right.

Festivals
Giving Offerings to 108 Monks Festival
Giving Offerings to 108 Monks Festival is held to make merit and has been practiced for decades. The attractive festival is held along the Bangkok Noi Canal at many temples including Wat Thai Charoen, Wat Bang Krai Nok, Wat Utthayan, and Wat Bang Krai Nai. This festival is annually held on the 8th day of the waning moon in the twelfth month of the lunar calendar.

Mon Dance Festival
Mon Dance Festival is one of the oldest Mon dramatic arts. The current Mons have managed to retain the skills of their forefathers. In Pak Kret, Phra Pradaeng and Pathum Thani, many people can still perform the Mon dance and the Mon alto oboe.

Nonthaburi Fruits Fair
Nonthaburi Fruits Fair is an annual fair held during April-June to celebrate the abundance of such local fruits as durian, mangosteen, mango, and star fruit. It is held beside the dam in front of the old city hall in Muang district. Ornamental flowers are also available.

The Mon Songkran
The Mon Songkran is held for one week after April 13th. The event features the Mon procession and entertainment. It is held around Pak Kret district office, Ko Kret.