Kalpakkam is situated about 70km south of Chennai on the coromandal coast of Bay of Bengal. It is surrounded by historic Sathurangapattinum (Sadras) at its north, Pudupattinam at its south and Bay of Bengal. It is famous for nuclear power plant and research work which includes Madras Atomic Power Station (MAPS), Indira Gandhi Centre for Atomic Research (IGCAR), Bhabha Atomic Research Centre (BARC) and Bharatiya Nabhikiya Vidyut Nigam Ltd (BHAVINI). These institutes come under Department of Atomic Energy (DAE). 6500 scientists, engineers and technical personnel along with their family are residing in the triplet township i.e Kalpakkam-Anupuram-Ammaipakkam.
Back water, lot of greenery, parks, sea etc. are some major attractions of the township. Backwater is the habitat of migratory and water birds. Truly, these townships are well maintained and picturesque one.