Central Haedir- This one is right by your starting point in the new land. From its spire you can see eight points of interest- the local barrow, 1 Shelob Memory, 2 ithildin, and 4 lost artifacts. In roughly clockwise order they are-
Eastern Haedir - If you've already captured the central haedir, than the barrow is already revealed. This leaves 2 ithildin, 3 lost artifacts, and one Shelob memory still be found (in roughly clockwise order).
The westmost haedir has nothing in common with the others except the Barrow. This leaves 4 lost artifacts, 1 Shelob memory, and 2 ithildin.