| Official Name: | Tongi |
| Native Name: | টঙ্গী |
| Settlement Type: | Town |
| Pushpin Map: | Bangladesh Dhaka division#Bangladesh |
| Pushpin Label Position: | bottom |
| Pushpin Mapsize: | 300 |
| Pushpin Map Caption: | Location in Dhaka Division##Location in Bangladesh |
| Coordinates: | 23.9°N 90.41°W |
| Subdivision Type: | Country |
| Subdivision Name: |  Bangladesh |
| Subdivision Type1: | Division |
| Subdivision Name1: | Dhaka Division |
| Subdivision Type2: | District |
| Subdivision Name2: | Gazipur District |
| Government Type: | Mayor–Council |
| Governing Body: | Gazipur City Corporation |
| Leader Title: | Paura Mayor |
| Unit Pref: | Metric |
| Area Total Km2: | 32.07 |
| Population Total: | 350,000 [1] |
| Population Density Km2: | auto |
| Population As Of: | 2011 |
| Population Blank1 Title: | Rank |
| Population Blank1: | 36th[2] |
| Population Blank2 Title: | Religions |
| Timezone: | Bangladesh Time |
| Utc Offset: | +6 |
| Postal Code Type: | Postal code |
| Blank Name: | National Dialing Code |
| Blank Info: | +880 |
| Blank1 Name: | Local Dialing Code |
Tongi (bn|টঙ্গী) is a major township in Gazipur, Bangladesh, with a population of 350,000. It hosts the Biswa Ijtema and features a BSCIC industrial area, which produces BDT 1500 crore of industrial products annually,[3] [4] and marks the northern border of Dhaka since 1786.[5] Tongi Shahid Smrity high School compound is mass burial site of the genocide in Liberation War of Bangladesh.[3]
Mir Jumla II (1660–1663) built a fort to protect the northern entry of Dhaka during his reign as a Mughal subadar (1660–1663).[5] [6] The subadar also built a bridge over the river Turag.[5] Mir Jumla constructed a road, now a part of the Dhaka-Mymensingh highway, that connected Tongi with Bag-e-Badshahi. It served as an axis of urban growth in the 19th and 20th centuries as sites for establishment of new urban settlements - Gulshan (formed in 1961), Banani (in 1964), Baridhara (in 1972) and Uttara (in 1965) - were picked off the highlands along that axis road.[5]
In 1786, Tongi-Jamalpur was designated as the northern boundary of Dhaka by the East India Company, reaffirmed by John Taylor, the first English Commercial Resident of Dhaka in 1800.[5]
Tongi, a thana (police station) within the Gazipur Sadar Upazila along with Joydebpur since 1983,[3] is located immediately north of Dhaka. It lies within the jurisdiction Gazipur District, which is a part of the Dhaka Division.
Geologically, the Tongi area comprises the southern extension of the Madhupur tract, a long narrow tract of tectonically elevated area of older sediments only a few metres above the surrounding rivers the Turag. Locally, the Tract is subdivided into the Bhawal Garh terrace which is a part of an inlier, an elevated area surrounded by lowlands by very young riverine sediments occupying the surrounding valleys. The older sediment sequence consists of sandstone of the Dupi Tila Formation overlain by Madhupur Clay, which in turn is overlain by alluvium. The elevation of the Tract varies from 2 to 14 m above mean sea level and it has shallow bedrock which forms a firm substrate for supporting large structures.[7]
Many of the people who live in Tongi commute to Dhaka each day, mainly by bus. Many people are also employed at factories in Export Processing Zones, areas given special tax and tariff exemptions by the government in order to stimulate industry.[8]
Tongi has a bordering river called the Turag River, it is very actively used by the local commuters and traders.[9] The annual Bishwa Ijtema is also held in Tongi beside the banks of Turag River.[10]
There are two thanas in Tongi – Tongi East[11] and Tongi West Thana.[12]
The newly constructed Tongi Diversion Road forms another important artery of the road network leading to Dhaka.[5]
The Narayanganj–Dhaka–Mymensingh State railway was opened in 1885–86.[5] Tongi has a break of gauge junction station in the same name where the new cross country line across the Jamuna Bridge from the western section joins the eastern section. Tongi is situated on the bank of the river Turag, transport boats and cargo boats are also available here.
Educational institutions in this area include:Shilmon Abdul Hakim Master High School