Well, this one took me a looooong time (and not just because the client never really got around providing me with labels of his own) and is probably my most work-intensive and complex map to date.
A single continent, cut off from rest of the world through a giant chain of mountains and treacherous seas.
Map preview at 50% because the full thing's file is just too large.
carcerem_50percent_by_stratomunchkin-d9uzksg.jpg
Here's a link to the full image at my DeviantArt Stash.