That's an intriguing image Murry, I like how the full spread of emission is showcased for the area, nice work. That ring is indeed very cool, I didn't know it was so bright in NII. I had a quick peruse to try and find an image or paper on it but couldn't find a paper, there must be one somewhere..? However it has been captured in Ha though eg.
Diaz Dobillo (far left edge, near top),
NandoPG Brazil (top edge right of centre), but doesn't show as obviously as in your image
Mike