When you are facing them, it is to your left at what looks like a dead end. When they open the passage, it should be pretty clear that you have a way through to Ishad N'ha.
You'll come out of that tunnel into more of the river and Ishad N'ha is west a ways, up a path that will be to your right.
: )
Moni
(make sure you click on all the key words cause I was obviously wrong about look to the west being the cue for the passage to open if it is still shut)
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