This cache should only be attempted by the boldest and brainiest of cachers. If you go to the listed coordinates, let me know what's there. I don't know.
In order to find this cache, you'll need to find the following three local caches:
River Lowlands
River Ridge
VIKING LEGEND Memorial
Inside each of these caches is a note telling you how far away from the final you are.
Do not disclose any spoilers in your log. I think it would be interesting to post how close your calculations get you to the final. If your calculations are reasonably accurate, a few minutes of exploration along with the hint should get you the final.
Good luck!
This cache has been chosen as a top pick on the CTCachers Forum