A history of the neighborhood

Everything that defines the neighborhood today arrived recently: the BTS station in 2011, True Digital Park in 2019, Cloud 11 in 2026. The corridor they sit on is much older. This is the long version — where the names come from, and how a canal district on Bangkok's eastern edge picked up a railway, a highway, a refinery, and a skytrain on its way to becoming the city's tech corridor.

Phra Khanong, the canal district

The oldest name here is Phra Khanong (พระโขนง) — the district, and the canal that runs through it. The name's origin is debated: possibly a Khmer word for "eyebrow," possibly from ขนอน (khanon), a customs post, a nod to the waterway's centuries-old role as a gateway on the water route south of the city. The district was once far larger than it is now. It was transferred from Phra Pradaeng province to Bangkok in 1927, then shrank as Khlong Toei and Prawet were carved out in 1989 and Bang Na in 1998, leaving two subdistricts — Bang Chak and Phra Khanong Tai — that hold much of the area this site covers.

The district also supplies Thailand's most famous ghost story. The legend of Mae Nak Phra Khanong — a wife who died in childbirth while her husband was away at war, and whose spirit stayed on keeping house, waiting for him — is set on the Phra Khanong canal near Wat Mahabut, off today's Sukhumvit Soi 77. The story is usually placed in the early Rattanakosin period, and her shrine at Wat Mahabut still draws a steady stream of visitors. Thai cinema has retold the story since 1936; the 2013 version, Pee Mak, grossed more than 1 billion THB and remains one of the highest-earning Thai films ever made.

Thailand's first railway ran through here (1893–1960)

Before Sukhumvit Road existed, the neighborhood was on a railway — the country's first. The Paknam Railway, a 21 km line from Hua Lamphong to Paknam (today's Samut Prakan), opened on April 11, 1893, with King Rama V — who had put up half of its 400,000 THB construction cost — attending the opening. Its 23 stations included stops at Phra Khanong and Bang Chak. The line was electrified in 1926 and ran for 66 years before it was closed on January 1, 1960, and dismantled. Two of its station names would eventually come back.

Sukhumvit Road and the sois (1936)

Sukhumvit Road opened in 1936 and is named after Phra Bisal Sukhumvit — born Prasob Sukhum, the fifth chief of Thailand's Department of Highways and the first Thai graduate of MIT (class of 1923, with a thesis on traffic regulation in Boston). The numbered sois followed the road, and several in this stretch carry names of their own: Soi 101 is Soi Punnawithi (ปุณณวิถี), Soi 103 is Soi Udom Suk (อุดมสุข). Both would later lend their names to BTS stations.

The refinery years (1964)

In 1964 a state oil refinery began operating in the district — the plant now known as the Bangchak Phra Khanong refinery. In 1984 the government established Bangchak Petroleum as a state enterprise to run it, taking the company's name from the Bang Chak (บางจาก) subdistrict — which makes this one of the few Bangkok neighborhoods with a national petrol brand named after it. The company was privatized in stages after the 1997 financial crisis, and the refinery still operates today.

Rail returns (1999, then 2011)

When the BTS Skytrain opened on December 5, 1999, the Sukhumvit Line ran 17 km from Mo Chit to On Nut — putting the neighborhood just past the end of the line. It stayed that way for twelve years. On August 12, 2011, the extension to Bearing opened five stations at once — Bang Chak, Punnawithi, Udom Suk, Bang Na, and Bearing — with free rides on the new stretch until the start of 2012. Punnawithi station takes its name from Soi Punnawithi (Sukhumvit 101); Udom Suk from Soi Udom Suk (Sukhumvit 103). Fifty-one years after the Paknam line closed, Bang Chak was a railway stop again.

The tech corridor (2019– )

The BTS extension set up the neighborhood's current chapter. In 2019, True Digital Park opened at Punnawithi station — a 200,000 sq m campus promoted as Southeast Asia's largest digital innovation hub, anchoring what its backers called the "Bangkok CyberTech District." In July 2026, Cloud 11 officially opened between Punnawithi and Udom Suk, aimed at the creator economy — and brought with it a new round of area branding: "South Sukhumvit." New names, same corridor.

The directory picks up where the history leaves off — what's here now, fact-checked and kept current. The updates page tracks what changes next.

Sources

Facts on this page last checked July 28, 2026.