In January 2015, it was ranked third in terms of per capita GDP.
The name Madras originated even before the British presence was established in India.
Chennai is located on the south–eastern coast of India in the north–eastern part of Tamil Nadu on a flat coastal plain known as the Eastern Coastal Plains.
A third river, the Kortalaiyar, travels through the northern fringes of the city before draining into the Bay of Bengal, at Ennore.
The region around Chennai has served as an important administrative, military, and economic centre for many centuries.
During the 1st century CE, a poet and weaver named Thiruvalluvar lived in the town of Mylapore (a neighbourhood of present Chennai).
Sandy areas are found along the river banks and coasts, and include areas such as Tiruvottiyur, George Town, Madhavaram, New Washermanpet, Chepauk, Mylapore, Porur, Adyar, Besant Nagar and Uthandi.
In these areas, rainwater runoff percolates quickly through the soil.