Oh, then you should have already went through there.. either that or I'm wrong, probably the second option. I'mma check myself since I'm currently in that area.
EDIT: Yep, just checked, I was right about that. If you know where the Grand Gate is, just go left once you go inside and follow the path. It should be pretty clear to follow it
Also, here's a pic of the area (My god, I forgot to rid of the white space e.e )