The Pagasetic Gulf () is a rounded gulf with a maximum depth of in the Magnesia regional unit of east-central Greece. It is formed by the Pelion peninsula and is connected to the Euboic Sea through a narrow channel about 4 km wide.

Its main port and largest city is Volos.

Mythology and history 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.

The gulf's name in Latin was Pagasaeus Sinus.

Places within the gulf In clockwise order: Amaliapolis, west, port Alos, west Almyros, west Nea Anchialos, northwest, beach and port Pagasae, northwest Demetrias, northwest Iolkos, northwest Volos, north, main port Agria, northeast, beach and port Neochori, east Argalasti, east, beaches (Lefokastro, Kalamos, Horto) Milina, southeast, beaches Trikeri, south, port at Agia Kyriaki

The gulf takes its name from the ancient city of Pagasae.

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