1. Hudson Bay (Canada): 1.23 million km2
2. Baffin Bay (Canada/Greenland): 1.15 million km2
3. Bay of Bengal (Bangladesh, India, Myanmar): 0.86 million km2
4. Gulf of Mexico (Mexico, United States, Cuba): 0.77 million km2
5. Great Australian Bight (Australia): 0.69 million km2
6. Bay of Biscay (France, Spain): 0.23 million km2
7. Persian Gulf (Iran, Iraq, Kuwait, Oman, Qatar, Saudi Arabia, United Arab Emirates): 0.24 million km2
8. Gulf of Alaska (United States, Canada): 0.21 million km2
9. Gulf of Thailand (Cambodia, Malaysia, Thailand, Vietnam): 0.18 million km2
10. Gulf of Guinea (Ghana, Angola, Benin, Cameroon, Congo, Democratic Republic of the Congo, Côte d'Ivoire, Equatorial Guinea, Gabon, Liberia, Nigeria, São Tomé and Príncipe, Togo): 0.16 million km2