I get quite a few searches on this site for Thailand Anacondas, and the truth is – there are no anacondas in Thailand – well, not any that are naturally occurring here. Someone could have brought one into the country as a pet I supposed. Anacondas are not native to Thailand, but, Pythons – the reticulated python and the Burmese python – are.
Pythons can grow to enormous size. Last night I played with a 4 meter python, and they do get 8 meters or so. Last time I saw a giant python was when it ate a villager’s goat and the city snake guys went to pick it up. It was on display for a few hours before they took it to the park and let it go. That snake was around 5-6 meters, a true-giant.