The following was an edit in one of the above posts, but I think it may have gotten lost, so I'm moving it here...
The Sodervirk Wall is supposed to stretch about 30 miles along the eastern edge of the Whiteheart Valley. I'm thinking it would make the most sense to mark it as shielding the town of Whiteheart from the surrounding hills, but another approach would be to put it due east of Whiteheart, between the town and the map label for Gnollheim. Any preferences?
Also, there are at least two wall symbols to play with: the Alphatia
map's row of diamonds (the simpler symbol), and the Renardy
map's angular line (the bigger, slightly more complex symbol). Which one do you prefer?
Regarding Darmouk... More Dragonking stuff...
I have to say, I dislike the way those books deal with Blackmoor, as if it just happened within recent history and is well known, rather than happening 4000 years ago and being mythical even among those few scholars who know anything at all about it. Yes, having old dragons and elves around could potentially change that a bit, but time is still time.
The other thing is that establishing Darmouk as so much bigger than Dengar seems a bit silly to me. If it were that amazing - and that close to Rockhome - surely the dwarves would have tried to reclaim it by now. Even a dragon would have problems fighting off a whole army of dwarves. Also, if it's so easy to find, why on earth is it still "lost"?
Anyway, such problems aside, there's no reason why we can't mark the names on the map and redevelop them later.
The "great ridge of stone" sounds like it's basically a small mountain in the middle of the valley. Note that "the forgotten city was not hollowed out from the great ridge of stone... instead it was far below", so the ridge itself doesn't have to be all that big. The dome itself is presumably not visible from the surface, buried entirely underground. (Going from this description at least - I don't remember if there was other information, or even what exactly happened at Darmouk in the novel.)
In any case, I don't think "wet" actually suggests a swamp - the valley is "filled with dense woods of tall pines". The swamp presumably does not have pine trees. I think the "wet" thing is more about the feeling of the place; you could certainly use that word to describe northern Scotland, which is not all that different from the Northern Reaches.
The next problem is that the valley is "shaped like a long oval basin set amid the mountains", and the ridge - described as "short" - is "in the very centre of the valley, almost completely surrounded by a cluster of lakes". Perhaps we should be looking for a smaller valley? But I'm having trouble finding an oval-shaped valley in the Northern Reaches. The lakes are no problem as they could be quite small.
Actually, perhaps the valley itself is also quite small. There are four such valleys (surrounded by mountains) in Vestland and Soderfjord on the Rockhome border (between Landersfjord and Snowvale). They don't exactly qualify as lowlands, but the quotation is somewhat ambiguous on this point - "just above the cool, wet lowlands" is where they descended, which could mean they descended to
the lowlands, or that the area they descended to was above
the lowlands. Perhaps one of these would be the best location. Currently they are all marked as hill hexes, but nothing in the description necessarily contradicts that.