Poison Dragon Swamp is one of the Five Poisons of Five Poisons Mountain. Cultivators can still barely use riding swords.
A dark green swamp over a range of a thousand li. Bubbles were emitted in the middle of the swamp with a gunong-gunong5 sound. After these bubbles burst apart, a wisp of green smoke rose. This green smoke filled the area above the swamp, carrying a type of corrosive scent. One look was all it took to know this was highly toxic.