NGC 3576 is a small emission nebula about half way between NGC 3372 and IC 2948. Judging from the arcs of nebulosity to the north (above) of the main nebula, there are very strong stellar winds blowing the gas away from hot young stars. Also, there is considerable dark nebulosity entwined with the bright regions. The bright knot to the east (left) of NGC 3576 is RCW 57, surrounding the open cluster NGC 3603. NGC 3576 is actually one one of several NGC designations for this nebula. Several of the brighter regions have their own NGC designations. These include 3579, 3581, 3582, 3584, and 3586. The very small, isolated patch of nebulosity to the lower left of the image does not appear to have a catalog designation.