Seto
noun
The rapids door originally meant a strait or channel, but these days it's mostly a place name: Seto. Some famous examples are Seto City (瀬戸市) in Aichi, known for its earthenware, and the Seto Inland Sea (瀬戸内海) between Honshu, Shikoku, and Kyūshū.
This is a jukugo word that uses the kun'yomi readings of the kanji. You should be able to read this on your own.
瀬戸内海の魚は美味しい。
Fish from the Seto Inland Sea is delicious.
赤西仁を瀬戸市で見たよ。
I saw Jin Akanishi in Seto City.
今日市場ですごくいい瀬戸物を見つけたんだよ。
I found really nice Seto ware at the market today.