An RPG Resource Review:
This level of the Dungeon Under the Mountain is known as the Undercity, and looking at the layout it is easy to see why - it does indeed look like a rather haphazard township. Although there is no descriptive text - that's left to you to provide! - I see this as one vast cavern in which some creatures, probably long-dead, built themselves homes to their own size. Now, of course, it is likely inhabited by opportunistic new arrivals, perhaps living in uneasy truce or perhaps waging open war... that's up to you to determine who lives there now and what they get up to when adventurers are not around.
The structures can be interpreted as dwellings, interspersed with what appear to be public buildings such as a temple, an arena and so on. The whole place comes on two levels, with a wall along the cliff-edge in which there is but a single gate (although there are some tunnels which the bravest of the brave might venture through). There are also several bodies of water, what looks a bit like a mausoleum and much more. And all of it is, as always, ready for you to populate as you please.
As always, there is a 1-page overview and 8 sectional maps, all vector-plotted so you can scale them as you wish. You also can control such things as room numbering, the presence of teleports and water, and whether or not you wish to have water present... just play with the 'Rule the Dungeon' button until you are happy with the results.
Overall, it is a very nice underground city plan which most of us will be able to find a use for, whether or not we are running the Dungeon Under the Mountain as one mammoth dungeon crawl.Rating: [4 of 5 Stars!]