The sea is the interconnected system of all the Earth's oceanic waters, including the Atlantic, Pacific, Indian, Southern and Arctic Oceans. [1] However, the word "sea" can also be used for many specific, much smaller bodies of seawater, such as the North Sea or the Red Sea.
A sea is generally smaller than an ocean. In fact, a sea is usually part of a larger ocean that is partially enclosed by land. Examples are the Red Sea and Mediterranean Sea.
1. On the sea, especially on a sea voyage. 2. In a state of confusion or perplexity; at a loss.