economic waters; economic zone
Refers to a maritime area where a country has special rights regarding the exploration and use of marine resources. Often used in the phrase 排他的経済水域 (exclusive economic zone).
その国は排他的経済水域を設定した。
That country established an exclusive economic zone.
経済水域内での漁業は厳しく規制されている。
Fishing within the economic zone is strictly regulated.