Neyyar Wildlife Sanctuary is located about 40 kms from the Thiruvananthapuram district. The sanctuary stretches from Neyyatinkara Taluk to the Mundanthurai Tiger Reserve in Tamil Nadu. It is the drainage basin of the Neyyar river and its tributaries, Mullayar and Kallar which originated in Agasthyarkoodam, the second highest peak in Kerala (1868 m). The Neyyar wildlife sanctuary was established in 1958. this sanctuary covers a total area of 128 square km. and the core area is only 60 kms. The vegeataion here comprises of the rugged terrain with rushing brooks and flat meadows. The diversity of the flora at Neyyar makes the sanctuary an ideal gene pool preserve. There are nearly 109 rare plants in the region. Medicinal plants abound in the Agastiar hills. The vegetation here consists of the tropical evergreen forest, mixed deciduous forest, sub tropical savannah and the read breeks. 

The major wildlife animals found in this sanctuary are the elephant, gaur, sambar, barking deer, wild boar, Indian porcupine, three-striped squirrel, tiger, Malabar squirrel, lion–tailed macaque, mouse deer, bonnet macaque, Nilgiri tahr, Nilgiri langur etc. Various reptiles are also found in this park like Cobra, viper, python, rat snake, flying snake, lizard etc. Besides these animals and reptiles various birds are also found in this sanctuary like Common muna, kingfisher, white-breasted water hen, little green heron, woodpecker, house crow, koel, Indian cuckoo, grey jungle fowl, hoopoe, jungle myna, darter, little cormorant, little egret, brahminy kite etc.

The other major tourist attraction in this sanctuary is the crocodile farm. Besides this the tourists can also enjoy the jungle safari and boat rides on the reservoir and trekking.