down the mekong river not too far from the khonephapeng waterfall. there is a rare freshwater species called the irrawaddy dolphins (or pah kha in lao language).the irrawaddy dolphins are a major attraction for tourist,as they are only found in this part of asia. before there were around a thousand of them,but ad tourism industry was not promoted in thispart of laos theidown the mekong river not too far from the khonephapeng waterfall. there is a rare freshwater species called the irrawaddy dolphins (or pah kha in lao language).the irrawaddy dolphins are a major attraction for tourists.as they are only found in this part of asia. before there were around a thousand of them.but ad tourism industry was not promoted in thispart of laos the irrawaddy dolphins did not expose to people from other places.rrawaddy dolphins did not expose to people from other places.