Yep it was the spiral stones for me too, thanks.
It was the islands in the south with the bonus board for me. Thanks!
I was stuck at 17/18 too. My 18th landmark was cave near the southest beauty spot (left down corner of the map → beach between Viking Bay and Skildor Watch)
Are you stuck? There a leap over to the Island that you might have missed.
so i have tried everything here. going through water, the stone… none of them work. what to do?
i fell off at here and ends up finding my last landmark
this was it tysm