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Message: <blockquote data-quote="Celebrim" data-source="post: 6837594" data-attributes="member: 4937">While World's Largest Dungeon is huge, my guess is that's probably only a 10th the size of Undermountain.  Skullport alone is probably nearly the size of WLD.  What makes WLD unique is that it is fully described, with every single room (more than 1600 of them) given a detailed description.  But in terms of size, it's probably not as big as Greyhawk Ruins, which I think has 3000 rooms, but most have only a one or two line blurb.What makes Undermountain so huge is that it was expanded on through multiple supplements.  But what may make it unsuitable for the project is that there are still large sections of Undermountain, each themselves nearly as large as WLD, which (at least to my knowledge) have not been thoroughly mapped or described in official material.  For example, "Ruins of Undermountain" only describes the upper levels of the dungeons, and not Skullport, the Promenade, the lower Dwarf delved levels, Madgoth's Castle, or any of the middle levels, or any of the dozen or more other sublevels that have been introduced over time.  Some further supplements have described or map portions of that, but not all of it.  The whole complex though is probably not less than 10000 encounter areas, and I'm pretty sure just the mapped parts are larger than WLD.</blockquote>