In the history of the Forbidden Lands there are many occasions when the difficulty of travel between Ravenland and Alderland is of importance. Since there are no maps of Alderland I've imagined the western coast continued southward from Ravenland into Alderland.
Then it struck me... why not travel to the Forbidden lands by boat? It suddenly seems illogical to build a giant wall in a mountain pass when you can just take a fisherman's boat to travel between the countries. Somewhat of a game breaker when it comes to world building...
I have a few thoughts on this myself. But would love to hear what you guys think of this.