Despite its density, Chennai incorporates unique ecological zones ranging from urban forests to coastal marshlands.
- **Guindy National Park:** Uniquely situated within city limits, this park is home to free-roaming blackbucks, spotted deer, and over 100 species of birds. - **Arignar Anna Zoological Park (Vandalur Zoo):** One of the largest zoos in South Asia, known for its sprawling, open-air enclosures and conservation breeding programs. - **The Theosophical Society Gardens:** A vast, tranquil green estate in Adyar that houses a 450-year-old banyan tree, one of the largest in the world. - **Semmozhi Poonga:** A beautifully landscaped 20-acre botanical garden in the heart of the city. - **Pallikaranai Wetland:** A crucial freshwater marshland in the southern suburbs that serves as a vital habitat for migratory birds.