That is where I went. That route leads to the cave that goes through to Undella Bay. I've fully explored the route and the cave, the only place I couldn't go is out a door that a Crustle is blocking (he won't move).
P.S. I removed "spoiler"as if it's about BW2, clearly it would be a spoiler. We don't need to label everything, as long as questions are clearly about BW2.