For someone (actor muɴ- & theme i-; s actor maN- & theme) to go upstream along a brook, river (loc ref -on).
ihlung; manlung; hinlung; mahlung
Maphod ya un tu'u ihlung hinan wangwang ta adi mun'ohab hi pundaldalānan.
It would be good for us to go upstream in the river so that we won't become hot in walking.
i-: ihlung; -iɴ-: hinlung
Usually implies walking, though boating or swimming might be the means of locomotion if the river allows it.