Thats becuase its in an explorable area and you cant map to it. Check directly North of Lions arch, or D'alessio Seaboard, almost as far north as you can go.
You will recieve a quest in Lion's Arch from one of the merchant's that will take you straight to the settlement. I also suggest taking the route through the bog skales as that will save you a lot of pain bypassing heavy tengu infested territory.
I recommend the path between the two. Both the plain full of Tengu and the swamp are harder, IMHO, than the middle path with the occasional skale and the occasional ettin.