The topography of Tamil Nadu is delightfully varied and diverse. Of the 1,30,058 sq-kms land area, 17.6% is covered with forest area. These spread over the plains and on mountain slopes. Dry lands are bestowed with dry-deciduous forests, thorn forests, scrubs and mangroves. The Western Ghats and a few cooler regions are endowed with moist deciduous, wet evergreen forests and grasslands. There are 5 national parks and 17 wildlife sanctuaries in Tamil Nadu. The famous wildlife sanctuaries are the Anamalai (Indira Gandhi) Wildlife Sanctuary, Calimere Wildlife Sanctuary, Kalakadu Wildlife Sanctuary, Mundanthurai Tiger Sanctuary, Kunthakulam Bird Sanctuary, Mudumalai Wildlife Sanctuary and National Park, Vedanthangal Bird Sanctuary and The Viralimalai Sanctuary. The Gulf of Mannar Marine National Park and the Guindy National Park are the most visited national parks in the state. Anna Zoological Park in Chennai is one of the latest and modern zoos of India. The Snake Park and the Crocodile Bank also located in Chennai are known for their collection of reptiles.