SH2-312 is the last object in Stewart Sharpless’s catalogue of 312 objects north of -27 deg.It is sometimes called the Pyxis nebula.

SH2-312 is enormous and this image covers only a part of it. Here we can see the leading edge, which looks like a wall with the steep drop
off in light. The overall appearance of the nebula section shown here has been described as looking like a waterfall.

There is a very small galaxy showing through on the upper right side. It is listed as NGC2488 and lies about 10 million ly away.

PlaneWave 12.5″ Astrograph with ZWO ASI 6200 camera, Astrodon filters and ASA gearless DDM-85 mount. F/5 LRGB (73x3min L, 21x3min RGB each, all 2×2 bin).