The Adyar River, originating from the Chembarambakkam Lake (Chengalpattu district), is one of the rivers which passes through Chennai, South India, and joins the Bay of Bengal. The Adyar River contributes to the estuarine ecosystem of Chennai. Chembarambakkam Lake is located in Chengalpattu district, about 40 km from Chennai, South India. ... Chingleput or Chengalpattu is a city in northern Tamil Nadu state of India. ... Chennai (சென்னை in Tamil), formerly known as Madras is the capital of the state of Tamil Nadu and is Indias fourth largest metropolis. ... A map of South India, its rivers, regions and water bodies. ... The Bay of Bengal is a sea that forms the northeastern part of the Indian Ocean. ... Estuaries and coastal waters are among the most productive ecosystems on Earth, providing numerous ecological, economic, cultural, and aesthetic benefits and services. ... In ecology, an ecosystem is a naturally occurring assemblage of organisms (plant, animal and other living organisms—also referred to as a biotic community or biocoenosis) living together with their environment (or biotope), functioning as a loose unit. ...