Anacondas include four species of aquatic boa inhabiting the swamps and rivers of the dense forests of tropical South America.
Anacondas have been reported to be as long as 30-45 m (98.4-147.6 ft). However most reports are unverified. Most larger anacondas have been recorded at around 30 feet with some reports of 50-60foot anacondas. The largest captured anaconda measured 35 feet.