This HII emission nebulae is Gum 10, also known as RCW 19 and Bran 127.  It is located 11,000 light years away in the constellation of Puppis at a declination of -36 degrees.  The largest circular HII region is 1 degree wide, which corresponds to a width of 200 light years.

It is believed that both of the circular HII regions are at the same distance.  This large beautiful object is so neglected that it is not even identified in the Astrobin plate solve.   I like the intricate details and depth of the foreground winding dark dust lanes through both HII regions.

The small HII object to the left is NGC 2579.  This object, also known as Gum 11, is an HII region located 25,000 light years away.  The region spans 2.5 arc-minutes in our apparent view, which corresponds to a width of 20 light years.  NGC 2579 is only the brighter, larger top part of this object. The bottom part is designated as ESO 370-9. Both objects have been recently incorrectly identified to be both planetary nebula and reflection nebulae. It is easy to tell in this image that they are both HII regions. They look to me to be part of the same object, but I have not seen that conclusion made anywhere in the literature.

The interesting cometary globules to the right are CG 30 and CG 31.  Gowrie (@gmadkat) has an interesting image and a nice description: 
"CG 30 and 31 are a cometary globule grouping located in Puppies within the Gum Nebula. The area consists of several globules and dark dust clouds as well as Herbig Haro object HH 120.
The Globules are estimated to be 1000 light years from here.  A cometary globule is an interstellar cloud with comet-like morphology, consisting of compact, dusty opaque heads with long faintly luminous tails. Unlike dark nebulae or dark dust clouds, CG’s are isolated neutral globules surrounded by a hot ionized medium.  Cometary Globules were only recently identified in 1976."

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The Gum catalog is the 1955 collection of 85 HII emission nebulae in the southern sky by the Australian astronomer Colin Gum. Some of the same objects appear in both the Gum and Sharpless catalogs. My Astrobin Gum collection is here.  Objects in the Gum catalog range up to -66 degrees south declination, so about 1/3 of them are out of my reach.