This is the 2933rd most frequent Chinese word.
海域
"海域" means "sea area" or "maritime zone."
In this sentence, "海域" is used to refer to a specific area of the sea distinguished by its biological richness.
这片海域的生物非常丰富。
The marine life in this area is very abundant.
Here, "海域" is used to indicate designated zones of the sea where specific regulations apply.
请注意，这些海域是禁止捕鱼的。
Please note that fishing is prohibited in these sea areas.
In this instance, "海域" denotes a spatial section of the sea being the subject of scientific investigation.