The Giant Anaconda is a super snake reported from the Amazon Basin, Brazil, Panama, Guyana, and other parts of South America. It is said to range from 50 to 150 feet long and is said to weigh 5 tons. Some say it is a unknown species, very old anacondas since normal anacondas keep growing until they die, or a extinct species. Natives have reported seeing anacondas 50 to 60 feet long and explorers have said to seen ones from 75 to 80 feet long. still Tales of Anacondas as long as 130 to 150 feet long persist but the scientific max length for a green anaconda is about 25 to 30 feet. It is possible that if a anaconda lives long enough that it can achieve a size of 40 feet or more depending how much food it has.