A vast emission nebula complex surrounding Sadr (γ Cygni), the star at the heart of the Northern Cross. The glowing hydrogen is split into bright lobes by intervening dark dust lanes — most strikingly the long curving channel that gives the brightest section its butterfly-wing appearance. Sadr itself lies in the foreground at around 1,800 light-years; the nebula sits far behind it at roughly 4,900, spanning well over 100 light-years across. One of the richest wide-field narrowband targets of the summer Milky Way, often framed alongside the open cluster NGC 6910 and the nearby Crescent Nebula.