Since I didn't manage to get it out of my head:
First try was blue hills with orange plane, but this gave a too high contrast.
Admittingly, the layout is not blessed by tremendous creativity and somehow came out as an amalgamation between Comet Catcher and Painted Desert.
Size is 16x18. But since the sea is acid (50 damage to slowly eat units), playable area is about13x15.
Map options for daytime+fog, as well as metal and wind. Includes the fog widget to make a slight fume mist over the acid sea (by default disabled in map options to avoid low FPS on slow systems).
Download and a few more details on springfiles
EDIT: had to update with a new version V1.1 since V1.0 had sync problems... somehow I seem to have a knack for this

Credits:
Features by Lathan, skyboxes and some detail texes from Smoth and Beherith. Scipts based on offical map blueprint container by jK.