The one in the middle, and the stream in the entering of the city. It has three bridges over it, therefore the lashes and the black strokes ^^
Ironforge is a dark place, and all the lava and dwarves (Ironforge is the capital city of the dwarves) makes me think is a dirty, sooty place. So.. Lava + soot = Orange and black smookey eye ^^
Ironforge inspiration:
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| Shape of the lava in the middle, and the long stream in the lower left corner |