Sharpless 2-106 (Sh2-106 or S106 for short) is a bipolar emission nebula and HII region. It measures about 2 light-years long by 0.5 light-year wide and is located about 2,000 light-years away in the constellation of Cygnus (the Swan), in a relatively isolated region of the Milky Way. Its mass may be as high as 25,000 times the mass of our Sun.