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A sea is either a large expanse of saline water connected with an ocean, or a large, usually saline, lake that lacks a natural outlet such as the Caspian Sea and the Dead Sea.

A swell, in the context of an ocean, is a formation of long wavelength ocean surface waves on the sea. Swells are far more stable in their directions and frequency than normal oceanic waves since they are formed by tropical storms and by stable wind systems.

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