sea area; waters
Refers to a defined area of the sea, often used in geographical, legal, or navigational contexts.
この海域ではイルカがよく見られる。
Dolphins are often seen in this sea area.
政府は新しい海域の調査を始めた。
The government began a survey of the new waters.
The typhoon is approaching the waters near Okinawa.
This area is known as dangerous waters because of many reefs.
Entering that sea area without permission is prohibited.
The cargo ship navigated the waters safely.