Considered of outstanding natural importance to the entire human race, the Agasthyamalai Biosphere Reserve, also known as Agasthyakoodam Biosphere Reserve, is known for its rich bio-diversity.

The Agasthyamalai landscape is recognised by the United Nations Educational, Scientific and Cultural Organisation (UNESCO) as a 3,500-km biosphere reserve falling within both Tamil Nadu and Kerala.

The Agasthyamalai landscape is recognised by the United Nations Educational, Scientific and Cultural Organisation (UNESCO) as a 3,500-km biosphere reserve falling within both Tamil Nadu and Kerala.