Can't get to Cloud Peaks (spoilers)

I've gotten to Baldur's Gate, and progressed Rasaad's quest to the point where we need to go to Cloud Peaks. I finished up in town and at the beginning of Ch. 6 decided to head down to Cloud Peaks. It shows up on my map but I can't get to it. Any suggestions?

Sidenote: I doubt I'm the first person with this trouble, but couldn't find any threads. The forum search function is not very good.