Actually you seem to have accidentally erased the Implarian ring of fire island chain.
See VB12 for a comparison:
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It already was distorted in VB13 (more room added to the east in the Implarian, cutting it strangely in half) and is now completely gone, so please restore it in the next update.
Releasing an update tomorrow. Changed around the empty plot labeling system, added requests since the last update, but tomorrow I'll be re-adding the Ring of Fire Islands and any new requests between then and now.
The next update will be a new thread/version, and I'll be asking for your capital name and location to put it on the map. So if you know where this is I'd advise placing a red dot on where you want it on mspaint or whatever in a small image and then waiting to post it in that new thread.