Mulla periyar Dam is constructed over the headwaters of the Periyar River in Kerala, India. The Periyar National Park, Thekkady is located around the Periyar reservoir formed by the backwaters of this dam. Although the dam is owned by Kerala and situated at Thekkady in Kerala, it is operated by the Government of Tamil Nadu according to a 999-year lease agreement made during erstwhile British colonial rule.

Periyar River is the longest river in the state of Kerala, India, with a length of 244 km. The river is also known as the lifeline of Kerala as it is one of the few perennial rivers of Kerala. It provides drinking water for major towns.

The Thekkady Wildlife Sanctuary, also known as the Periyar Wildlife Sanctuary, lies in the outskirts of Thekkady town, in Idukki district. Probably one of India's most popular wildlife sanctuaries, the Thekkady Wildlife Sanctuary is home to tigers, elephants, langurs, gaurs and macaques, besides many smaller mammals and reptiles.

The Thekkady Wildlife Sanctuary lies on the Western Ghats, consisting of acres of evergreen forests, savannah grasslands and deciduous woods. Feel yourself one with nature on an exciting wildlife tour to the Thekkady Wildlife Sanctuary. The lush forests, typical of the Western Ghat hill ranges of Kerala, are home to a variety of plants and animals.