A Puff-faced Water Snake. In Thai it is named ngu hua ka-lohk, meaning ‘cranium-headed snake’, and referring to the mask-like markings on its broad head, which are somewhat reminiscent of a human skull.

Adults may grow to a length of 137 centimeters and have a faded reddish brown body and tail, with grayish green, black-edged bands above, whilst the belly is a whitish pale.