Tales of Innocence

I am VERY lost! Could somebody please tell me how you get to the Holy City of Naos? I can find their guild dungeon just fine, and I can see it on the world map that's been posted here, but what I can't see is how to get past the mountain and the water to walk through the front gates.

Check this out:
http://www.gamefaqs.com/ds/942204-tales-of-innocence/faqs/60367
It should be helpful xD