Where is Grey Valley in World of Warcraft?

If it is an alliance, go straight down from the Black Coast and follow the road to Grey Valley. An island in the middle of the map is the gathering place of the alliance.

If it is a tribe, go straight up from the intersection and follow the road to Grey Valley. Go straight ahead and there is a similar intersection. Turn right and you will reach the tribal territory not far away.

In the above two places, there are hotels and flying spots in each camp. The alliance can fly directly from the Black Coast to Grey Valley. The tribe can only fly from the intersection to the broken wood sentry post.