I knew about Kumamoto’s reputation for having excellent water (especially ground water) and I also knew about semiconductors being manufactured in this area. Until I read this sentence, however, I hadn’t put the two together.

“Kumamoto is known for having an abundance of water, necessary when manufacturing semiconductors.”

– Kirk

https://www.japantimes.co.jp/news/2021/07/28/business/corporate-business/tsmc-taiwan-chipmaking-kumamoto/

Another article:

https://english.kyodonews.net/news/2021/07/48a21b9f9c7e-taiwans-tsmc-eyes-kumamoto-as-site-for-1st-japan-chip-plant.html