Board Thread:Speculation House/@comment-4141313-20180330215009/@comment-24993958-20180330220043

Well...you see...iirc...

We, as in the wiki members, don't talk about it cause in a podcast we found out that Remnant, that is to say the map, was made by putting ketchup on a napkin that got crumpled, which resulted in the dragon looking thing.

As for in universe? I dunno, the main cast only found out about Salem recently so they probably just thought the dragon continent looked cool and never gave it a second glance.