As scalla said there is a portal available that will take you to a section where you need to kill a lord and lady npc.
Change to your dragon form and carefully fly around as much as you can while sticking close to the cliffs.
On one outcrop on a cliff you will find the necessary portal.
Good Luck, I found the Orobas Fjords a rather frustrating part of the game due to the lack of directions but you will eventually get to progress further.
