Great ! Threw me for a loop when the default came up with tilted hexes (also had to hunt down my preset display settings I use- although the map viewer is agnostic as far as that goes).
Can we get a list of all the possible terrain types (what you use to populate Terrain="") field in the JSON ? I want to make an enum something similiar in case of future changes/additions ?
And now that you have water defined, maybe you can have water features (Bays, Seas etc) ? Haven't seen any generated yet so maybe they are there. Maybe even multiple of the map is large enough (e.g. a Bay off the coast that is in a Sea etc etc).
My travails with getting the UI to behave continue apace....
Excellent Work !