page_title: Gulf of İzmit
hierarchical_section_title: Gulf of İzmit
caption_attribution_description: English&#x3a;&#32; Map of the Sea of Marmara. Bounding box West 26°, South 39.8°, East 30°, North 41.5°.Español&#x202f;&#x3a;&#32; Mapa del Mar de MarmaraFrançais&#x202f;&#x3a;&#32; Carte du détroit des Dardanelles (à la gauche), de la mer de Marmara (au centre) et du détroit du Bhosphore (à la droite). Coordonnées des limites du rectangle&#160;: West 26°, South 39.8°, East 30°, North 41.5°.
context_page_description: Gulf of İzmit, also referred to as Izmit Bay, is a bay at the easternmost edge of the Sea of Marmara, in Kocaeli Province, Turkey.
  It's ancient names were Gulf of Astacus, Sinus Astacenus, Olbianus Sinus and Gulf of Nicomedia.
  It took the names Gulf of Astacus and Sinus Astacenus from the city Astacus.
  The gulf takes its name from the city of İzmit, other cities and towns around the bay being Gebze, Körfez, Gölcük, and Altınova. In the east–west direction, it extends for a length of about 48 kilometres, while in the north–south direction its width varies from 2 to 3 kilometres at the narrowest spots to about 10 kilometres at its widest. The İzmit Bay Bridge is a suspension bridge that bridges the gulf.
context_section_description: Gulf of İzmit (Turkish: İzmit Körfezi),  also referred to as Izmit Bay, is a bay at the easternmost edge of the Sea of Marmara, in Kocaeli Province, Turkey.
  It's ancient names were Gulf of Astacus, Sinus Astacenus (Ancient Greek: Ἀστακηνὸς κόλπος), Olbianus Sinus (Ancient Greek: Ὀλβιανὸς κόλπος, romanized: Olbianos kolpos) and Gulf of Nicomedia.
  It took the names Gulf of Astacus and Sinus Astacenus from the city Astacus.
  The gulf takes its name from the city of İzmit, other cities and towns around the bay being Gebze, Körfez, Gölcük, and Altınova. In the east–west direction, it extends for a length of about 48 kilometres (30 mi), while in the north–south direction its width varies from 2 to 3 kilometres (1.2 to 1.9 mi) at the narrowest spots to about 10 kilometres (6.2 mi) at its widest. The İzmit Bay Bridge is a suspension bridge that bridges the gulf.
caption: Gulf of İzmit (Sea of Marmara)
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