1. (noun) the bottom of a sea or ocean

• davy jones's locker
• ocean bottom
• ocean floor
• sea bottom
• sea floor
• seabed

1. (noun) the bottom of a sea or ocean

• abyssal zone
• bathyal district
• bathyal zone
• continental slope
• continental shelf
• neritic zone
• twilight zone

1. (noun) the bottom of a sea or ocean

• bed
• bottom