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There are only three obelisks, and they are not that difficult to find. I always dug up the grail in different places.;) The first obelisk is located when going from the sawmill towards the lake, through the forest. The second is in the center of the map, near the edge of the road, and the third is at the bottom of the map, slightly to the left. Good luck.:)
2 Sergey, please read the topic more carefully; the locations of the obelisks have already been discussed.