Sh 2-129 (also known as the Flying Bat Nebula), is a large emission nebula and H II region located in the constellation Cepheus. It is part of the Cepheus molecular cloud complex and belongs to the Cep OB2 association. Reflection nebula vdB 140 can be seen near Sh 2-129. Within Sh 2-129 lies a bipolar outflow nebula named Ou 4 (also known as Squid Nebula). The central star of Ou4 is believed to be the massive triple star system named HD 202214 (O9.5IV).
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