depth 102 metres) in the Magnesia regional unit (east central Greece) that is formed by the Mount Pelion peninsula.

The passage into the Euboic Sea is narrow and is about 4 km.

The gulf is named after its historic major port, Pagasae, from which mythology says that Jason built his ship the Argo and from which he sailed on his adventurous voyage.

[1] The gulf's name in Latin was Pagasaeus Sinus.

[2] In clockwise order: The gulf took its name from the ancient city of Pagasae.