My first post on this website, can't believe I haven't found this before

This is one of my first maps I had made, I made it for a group of Role-Players that role-play countries and stuff. I have been continually expanding the edges of the map to have more people. I'm running out of Ideas for continents .
Click image for larger version. 

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I've also been thinking of changing how I have it looking a bit more textured than it is just flat now.
If you have any ideas on improving my continual project please offer, I'd appreciate it!