| Chengam | |
| Native Name: | sezhunganiyur |
| Native Name Lang: | Tamil |
| Settlement Type: | Selection Grade Town panchayat |
| Pushpin Map: | India Tamil Nadu |
| Pushpin Label Position: | right |
| Pushpin Map Caption: | Location in Tamil Nadu, India |
| Coordinates: | 12.3°N 78.8°W |
| Subdivision Type: | Country |
| Subdivision Name: |  India |
| Subdivision Type1: | State |
| Subdivision Name1: | Tamil Nadu |
| Subdivision Type2: | District |
| Subdivision Name2: | Tiruvannamalai |
| Unit Pref: | Metric |
| Elevation M: | 272 |
| Population Total: | 54278 |
| Population As Of: | 2011 |
| Population Density Km2: | auto |
| Demographics Type1: | Languages |
| Demographics1 Title1: | Official |
| Demographics1 Info1: | Tamil |
| Timezone1: | IST |
| Utc Offset1: | +5:30 |
| Postal Code: | 606 701 |
| Registration Plate: | TN 25 |
| Website: | www.chengam.in |
Chengam (or Chengamma[1] as on British records) is an important market town and a taluk headquarter[2] in the Foot hills of Eastern ghats[3] in Tiruvannamalai district of Tamil Nadu, India. Chengam is the gateway to the Chengam pass[4] in the Eastern ghats between Javvadhu hills to the north and Chennakesava hills to the south. The town is also the centre for various industrial activities which includes Sathanur dam hydro-electric project,[5] Aavin milk processing plant[6] and Periya Kolappadi SIDCO estate.[7]
The book Malaipadukadam in the Sangakkala literature mentions that Nannansei Nannan was a short-lived king who ruled from the Palkunrakottam hill with his capital as his capital. Many rare historical sources such as inscriptions and archeological finds have been found to prove this. Researchers also say that Nannan-ruled Navira Hill now refers to the Jawadhu Hills and some to the mountains near the sea. Initially Chengam was an assembly constituency (SC) of Tiruppattur (Lok Sabha constituency). In 2009 it became a part of the Tiruvannamalai Lok Sabha constituency.
Chengam is located at .[8] It has an average elevation of 272 metres (892 feet). Chengam municipality is located on the Pondicherry – Thiruvannamalai – Bangalore route, at a distance of 34 km from Thiruvannamalai. Climate : Chengam rainfall with a average of 1200.35mm per year, which is mostly getting during northeast monsoon when it is September,October, November, December
Chengam is a municipality in Tiruvannamalai district. India census,[9] Chengam had a population of 54,278 and an average literacy rate of 79.3%. Child population below 6 was 2,210 males and 2,479 females.Chengam has 142,845 people employed; 84,623 are male and 58,222 are female with an employment ratio of 50%. Chengam is 5th in Tiruvannamalai district and ranked 69th in Tamil Nadu. The literacy ratio is 68% with 170,277 total literate people. In terms of literacy, Chengam is ranked 6th in Tiruvannamalai district and 230th in Tamil Nadu.
It is a part of the Tiruvannamalai (Lok Sabha constituency) since 2009.
Chengam Sri VenuGopala Parthasarathy Perumal Temple is more than 700 years old. Its architecture and layout is a model for Annamalaiyar Temple. For this festival the temple is decorated with colored lights, fireworks, naiyantimelam, karakattam (dance). Preparations are made for the show by the festival committee and sponsors.
Chengam lies on the mid-way of NH66 plying from Bangalore to Puducherry via Thiruvannamalai. It is separated from Thiruvannamalai at a distance of 35 km. It is well connected with major nearby Metro City Is Vellore City. Major towns like Arani, Polur, Thiruvannamalai, Singarapettai, Pudupalayam, Sathanur Dam, Thandarampattu and Uthangarai. Frequent buses ply from Chengam to Salem, Dharmapuri, Bangalore, Hosur, Krishnagiri, Tirupattur, Vellore, Chennai, Polur, Uthangarai, Hogenakkal, Pondicherry, Thiruvannamalai, Kallakurichi, Vizhuppuram and Chidambaram.
Local town buses ply to Sathanur Dam, Kadaladi, Kanchi, Polur, Pudupalayam, Singarapettai, Neepathurai, Mel ravanthavadi, Thaazhaiyoothu, Thandarampattu, Pachal and many other villages.