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It's been a while, so I may be completely wrong here. But I think that was the same one I was missing when I first played. If it is, then...
There's a level where you start on a small piece of rock with two islands that each have a totem forming a semi-circle around a growing volcano. A third totem is on a partially submerged island. There is also a memory stone submerged in the water that can be very hard to spot if you aren't actively looking for it. Look under the water along the pathway from where you start to the two totems. It should be a little out towards the sea side rather than towards the volcano side.
Hope that's the one you're missing and that this helps.