Territorial waters: the maritime area over which a state exercises sovereignty, typically extending a defined distance from the coast and affecting fishing rights and jurisdiction.
その船は無許可で日本の領海に入ったと報告された。
The vessel was reported to have entered Japanese territorial waters without permission.
領海の境界を巡って近隣国と交渉が行われた。
Negotiations were held with a neighboring country over the boundary of territorial waters.
漁船は領海内で漁をする権利があるが、他国の領海では規制がある。
Fishing boats have the right to fish within their territorial waters, but there are regulations in other countries' territorial waters.