Cygnus Molecular Nebula Complex
The Cygnus Molecular Nebular Complex (also known simply as the Swan Complex) is a giant molecular cloud located in the heart of the boreal Milky Way, in the direction of the constellation Cygnus. It is one of the most turbulent star-forming areas in the Milky Way Galaxy and its largest known molecular nebula complex.
Source: Wikipedia — Cygnus Molecular Nebula Complex (CC BY-SA 4.0)