How do I get past this door on the Storm Coast?

Question

I'm exploring the Storm Coast, trying to clear everything I can in the zone, and there's several markers for Varric's personal quest on the map:

As you can see in that screenshot, there's a cave marker near them. When I go there, though, all I find is this, which appears to be a door:

There's no option to activate it, and searching up and down the area, I can't see a way around it. So, just how am I supposed to get up into that area to my North-West?

Answer 1

The door is quest-locked until you're on the "Red Water" quest. Once you begin that quest, the door should be open and you will be able to destroy the four Red Lyrium veins inside.