So, I decided that the shape was water. I'll be doing the whole map with historical brushes (in GIMP) so kindly made available by K. M. Alexander. I've been wanting to play around with them for awhile. I will note that since I've installed (all of) them, GIMP takes a little longer to open.

### Latest WIP ###
Click image for larger version. 

Name:	JulyAugustCGLite.png 
Views:	31 
Size:	675.9 KB 
ID:	124267