- 大洋洲 dàyángzhōu OceaniaOceania; a continent located in the southwest Pacific Ocean including Australia, New Zealand, and thousands of smaller islands
- 现大洋 xiàndàyáng silver dollarsilver dollar coin used as currency in old China
- 南大洋 nándàyáng Southern Oceanthe Southern Ocean surrounding Antarctica
- 泛大洋 fàndàyáng Panthalassathe vast global ocean that surrounded the supercontinent Pangaea during the late Paleozoic and the early Mesozoic eras
- 大洋型地壳 dàyángxíngdìqiào oceanic crustthe outermost layer of Earth's lithosphere that is found under the oceans
- 大洋中脊 dàyángzhōngjǐ mid-ocean ridgemid-ocean ridge; an underwater mountain range formed by plate tectonics
- 三大洋 sāndàyáng the three major oceansThe collective name for the Pacific, Atlantic, and Indian Oceans.
- 大洋龙 dàyánglóng halisaurusa genus of extinct marine lizard belonging to the mosasaur family
