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state (of the US, Australia, India, Germany, etc.); province (e.g. of Canada); county (e.g. of the UK); region (e.g. of Italy); canton; oblast
continent
province (of Japan)
province (of ancient China); prefecture; department
アメリカには五十の洲があることを学んだ。
I learned that America has fifty states.
この洲は農業が盛んな地域として知られる。
This state is known as a region where agriculture thrives.
洲ごとに法律が異なるのが面白いと思う。
I find it interesting that laws differ from state to state.