sandbank; sandbar
「州」 has another reading with different meanings.
state (of the US, Australia, India, Germany, etc.); province (e.g. of Canada); …
彼は中西部の州の出身なんだよ。
He's from a Midwestern state.
この州の法律は厳しいらしいよ。
The laws of this state seem to be strict.
この州の海岸には美しい砂の州が広がる。
Beautiful sandbars spread along the coast of this area.