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The Cartographers’ Guild is a forum created by and for map makers and aficionados, a place where every aspect of cartography can be admired, examined, learned, and discussed. Our membership consists of professional designers and artists, hobbyists, and amateurs—all are welcome to join and participate in the quest for cartographic skill and knowledge.
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... but basically you could make 2 maps, above- and underground. If you don't want to do that, then mark on your above ground map the entry to to underground city - and if your scale is to big to show that, then you have to use markers instead.
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