Chennai formerly known as Madras is the capital of the Indian state of Tamil Nadu. Located on the Coromandel Coast of the Bay of Bengal, Chennai has an estimated population of 7.5 million (2007), making it the fourth largest metropolitan city in India.
The city was established in the 17th century by the British, who developed it into a major urban centre and naval base. By the 20th century, it had become an important administrative centre, as the capital of the Madras Presidency.
Chennai's economy has a broad industrial base in the automobile, technology, hardware manufacturing, and healthcare industries. The city is home to much of India's automobile industry and is the country's second-largest exporter of Software, information technology (IT) and information-technology-enabled services (ITES), behind Bangalore.
The city is served by an international airport and two major ports; it is connected to the rest of the country by five national highways and two railway terminals. Thirty-five countries have consulates in Chennai.
Chennai hosts a large cultural event, the annual Madras Music Season, which includes performances by hundreds of artists. The city has a vibrant theatre scene and is an important centre for the Bharatanatyam, a classical dance form. The Tamil film industry, known as Kollywood, is based in the city; the soundtracks of the movies dominate its music scene. Chennai is known for its sport venues and hosts an Association of Tennis Professionals (ATP) event, the Chennai Open. The city faces problems of water shortages, traffic congestion and air pollution. The state and local governments have undertaken initiatives such as the Veeranam project, Rainwater harvesting and the construction of mini-flyovers to address some of these problems.
NAMES
The name Chennai is an eponym, etymologically derived from Chennapattinam or Chennapattanam, the name of the town that grew up around Fort St. George, built by the British in 1640. There are different versions about the origin of the name. When the British landed here in 1639 A.D. it was said to be part of the empire of the Raja of Chandragiri. The British named it Chennapatnam after they acquired it from Chennappa Nayaka, a Vijayanagar chieftain. Gradually, the name was shortened to Chennai. The first instance of the use of the name Chennai is said to be in a sale deed dated August 1639 to Francis Day, an agent for the British where there is a reference to Chennaipattinam.
Although some believe Chennapattinam was named after the Chenna Kesava Perumal Temple, as the word Chenni in Tamil means face, and the temple was thought of as the face of the city.
The former name, Madras, is derived from Madraspattinam, a fishing village that lay to the north of Fort St. George. The origin of the name Madraspattinam is a subject of disagreement. One theory holds that the Portuguese, who arrived in the area in the 16th century, may have named the village Madre de Deus. However, historians believe that the village's name came from the once prominent Madeiros family (variously known as Madera or Madra in succeeding years), who had consecrated the Madre de Deus church in Santhome in 1575 (demolished in 1997). Another theory says that the village was named after an Islamic college (a madrasa) which was located in the area. After the British gained possession of the area in the 17th century, the two towns, Madraspattinam and Chennapattinam, eventually merged. The British referred to the united town as Madraspattinam, while the locals preferred to call it Chennapattinam.
The city was officially renamed Chennai in 1996, about the same time that many Indian cities were undergoing name changes. Madras was seen as a Portuguese name.
History

Madras Central Railway Station, 1925
The region around Chennai has served as an important administrative, military, and economic centre since the 1st century. It has been ruled by various South Indian dynasties, notably the Pallava, the Chola, the Pandya, and Vijaynagar. The town of Mylapore, now part of Chennai, was once a major Pallavan port. The Portuguese arrived in 1522 and built a port called São Tomé after the Christian apostle, St Thomas, who is believed to have preached in the area between 52 and 70 CE. In 1612, the Dutch established themselves near Pulicat, just north of the city.
On 22 August 1639, Francis Day of the British East India Company bought a small strip of land on the Coromandel Coast from the Vijayanagara King, Peda Venkata Raya in Chandragiri. The region was ruled by Damerla Venkatapathy, the Nayak of Vandavasi. He granted the British permission to build a factory and warehouse for their trading enterprises. A year later, the British built Fort St George, which became the nucleus of the growing colonial city. In 1746, Fort St. George and Madras were captured by the French under General La Bourdonnais, the Governor of Mauritius, who plundered the town and its outlying villages. The British regained control in 1749 through the Treaty of Aix-la-Chapelle and fortified the town's fortress wall to withstand further attacks from the French and another looming threat, Hyder Ali, the Sultan of Mysore. By the late 18th century, the British had conquered most of the region around Tamil Nadu and the northern modern-day states of Andhra Pradesh and Karnataka, establishing the Madras Presidency with Madras as the capital. Under British rule, the city grew into a major urban centre and naval base.
Victoria Public Hall at Park Town, Chennai - one of the finest examples of British architecture in the city
With the advent of railways in India in the late 19th century, the thriving urban centre was connected to other important cities such as Bombay and Calcutta, promoting increased communication and trade with the hinterland. Madras was briefly under Portuguese and French rule during 16th & 18th century.
Madras was the only Indian city to be attacked by the Central Powers during World War I, when an oil depot was shelled by the German light cruiser SMS Emden on September 22, 1914, as it raided shipping lanes in the Indian Ocean, causing disruption to shipping.[14] After India gained its independence in 1947, the city became the capital of Madras State, renamed the state of Tamil Nadu in 1969. The violent agitations of 1965 against the imposition of Hindi as the national language, marked a major shift in the political dynamics of the city and the whole state.
In 2004, an Indian Ocean tsunami lashed the shores of Chennai, killing many and permanently altering the coastline.
Geography and climate
Chennai is on the southeast coast of India in the northeast of Tamil Nadu on a flat coastal plain known as the Eastern Coastal Plains. Its average elevation is around 6.7 metres (20 ft), and its highest point is 60 m (200 ft). The Marina Beach runs for 12 km along the shoreline of the city. Two rivers meander through Chennai, the Cooum River (or Koovam) through the centre and the Adyar River to the south. A third river, the Kortalaiyar, flows through the northern fringes of the city before draining into the sea at Ennore. Adyar and Cooum rivers are heavily polluted with effluents and waste from domestic and commercial sources. The state government periodically removes silt and pollution from the Adyar, which is much less polluted than the Cooum. A protected estuary on the Adyar forms a natural habitat for several species of birds and animals. The Buckingham Canal, 4 km (3 miles) inland, runs parallel to the coast, linking the two rivers. The Otteri Nullah, an east-west stream, runs through north Chennai and meets the Buckingham Canal at Basin Bridge. Several lakes of varying size are located on the western fringes of the city. Red Hills, Sholavaram and Chembarambakkam Lake supply Chennai with potable water. Groundwater sources are becoming brackish.
Chennai's soil is mostly clay, shale and sandstone. Sandy areas are found along the river banks and coasts, such as Tiruvanmiyur, Adyar, Kottivakkam, Santhome, George Town, Tondiarpet and the rest of coastal Chennai. Here rainwater runoff percolates quickly through the soil. Clay underlies most of the city including T. Nagar, West Mambalam, Anna Nagar, Perambur and Virugambakkam. Areas of hard rock include Guindy, Velachery, Adambakkam and a part of Saidapet.

Chennai Metropolitan Police Patrol
The metropolitan region of Chennai covers many suburbs that are part of Kanchipuram and Thiruvallur districts. The larger suburbs are governed by town municipalities, and the smaller ones are governed by town councils called panchayats. While the city covers an area of 174 km² (67 mi²),the metropolitan area is spread over 1,189 km² (458 mi²).The Chennai Metropolitan Development Authority (CMDA) has drafted a Second Master Plan that aims to develop satellite townships around the city. Contiguous satellite towns include Mahabalipuram to the south, Chengalpattu and Maraimalai Nagar to the southwest, and Kanchipuram town, Sriperumpudur, Tiruvallur and Arakkonam to the west.
The Greater Chennai Police department, a division of the Tamil Nadu Police, is the law enforcement agency in the city. The city police force is headed by a commissioner of police, and administrative control rests with the Tamil Nadu Home Ministry. The department consists of 36 subdivisions with a total of 121 police stations, of which 15 are ISO 9001:2000 certified. The city's traffic is managed by the Chennai City Traffic Police (CCTP). The Metropolitan suburbs are policed by the Chennai Metropolitan Police, and outer district areas are policed by the Kanchipuram and Thiruvallur police departments.