Nanoha's mind is a grassy/forested meadow by the shore underneath a wide blue sky. The grass and trees seem haphazardly thrown together as if from different forests - and they are. One is the forest where as a girl she first met Yuuno and started it all, and the other is the place where she and Fate first met.

Fate would also recognize the waterfront, with a little bridge and then a straight drop to the water, because it's where the two of them first made a vow and exchanged ribbons. As for the rest of it, the most striking feature is how, despite the trees, the sky seems to stretch on forever all around you.