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Ive found like 5 so far, there seems to be a few more as there seems to be some secret moonbeam doors in the area. You have the 4 or 6 moonbeam doors at the bottom level then 2 more up top.
I was climbing stuff and found a moonbeam door at the top of some cliff and another hidden away in a wall which you could only get to by climbing a rock, jumping to a ledge and then jumping to the gap in the wall. Not much of an explanation but you just gotta climb stuff xD