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South Tangerang abbreviated as Tangsel, is a city in the province of Banten, Indonesia. Located on the southwestern border of Jakarta, the city forms part of the Greater Jakarta metropolitan area. It was administratively separated from Tangerang Regency on 26 November 2008. According to the 2020 Census, the city population was 1,354,350 inhabitants, while the official estimate as of mid-2024 was 1,429,629 - comprising 712,409 males and 717,120 females. The total area is. It is the second-largest city in Banten (after Tangerang immediately to its north) in terms of population, and has grown rapidly, not only as Jakarta's satellite city, but also as the development of business districts and commerce due to presence of large-scale planned town by private developers.

South Tangerang is home to some planned towns built by private developers, the notable ones are Alam Sutera (in North Serpong), BSD City (in Serpong and Setu), and Bintaro Jaya (in Pondok Aren and Ciputat), complete with facilities such as business centers, hospitals, shopping malls, and international schools such as British School Jakarta, Global Jaya School, German School Jakarta (Deutsche Schule Jakarta), and a Monash University campus in BSD, among other prominent private universities. In the same city, there is another major mixed‑use development called SouthCity, a 57‑hectare superblock in the Pondok Cabe area that includes residential neighbourhoods, commercial spaces, and planned lifestyle facilities, as well as a joint investment of over Rp 1 trillion to build a regional shopping mall within the superblock, reflecting its role in South Tangerang's evolving urban landscape. Currently, the average land price in South Tangerang is the most expensive among Jakarta's satellite cities.

Languages map in South Tangerang. The dominant languages used in South Tangerang are Betawi and Tangerang Sundanese languages. Betawi is spoken in almost all areas of South Tangerang, except in the western part along the Cisadane River. Meanwhile, Sundanese is spoken in the west along the Cisadane River, which is predominantly used in villages on the banks of the river, especially in North Serpong. In several communities located in the western part there are also several areas undergoing a language shift, which are mostly found in Serpong, Setu, and a small number of villages in the western part of Pondok Aren. In fact, there is a village in Setu district namely the Keranggan Ecotourism and Sundanese Culture Village (Kampung Ekowisata dan Budaya Sunda Keranggan), where almost all the people used to speak Sundanese (currently it is only spoken predominantly in 2 RT).

The municipality of South Tangerang is an autonomous city established on 26 November 2008, based on Banten province's constitution. This establishment was a division out of the Tangerang Regency, to support the better development of government service, construction project, community service, and also to utilize the natural potential so that a greater public welfare could be achieved.

Situ Gintung reservoir was built by the Dutch colonial authorities in 1933. It is located at the kelurahan of Cirendeu in East Ciputat District. It was surrounded by a dam up to 16 metres (52 ft) high, which failed on 27 March 2009 with the resulting floods killing at least 93 people.

South Tangerang has a tropical rainforest climate (Köppen: Af) and situated in the alluvial lowland with moderate rainfall from May to September and heavy rainfall from October to April.