It is 2.5 hours by land from Fukuoka City, 1.5 hours by land from Nagasaki City, and 30 minutes by ferry from Kumamoto City.
There is Shimabara, one of the cities rich in water.
In Japan, it is well known because of the opportunity to learn about it during history time and the great pyroclastic flow disaster in 1991.
One of the images from the 1991 disaster
The groundwater, which was filtered through the volcanic ash and sand rubble layers due to the crustal movement of the 1792 volcanic disaster and other factors, is said to be very delicate and high quality spring water.
In Shimabara City, there are more than 70 spring sites, and the amount of spring water is said to be 200,000 tons per day.
I will introduce one of them in this article.
Shimabara Spring Group Hamanokawa Spring
https://maps.app.goo.gl/zh5fVAoywZRymSx4A
This area is divided into four compartments with specific uses.
The system is such that the water is used in order of proximity to where the water springs, from the top to the bottom, depending on the use, such as where to wash groceries, wash dishes, select clothing, etc.
Even if the water comes from a large amount of springs, it is used with care. The locals have long had rules in place that truly take the natural environment into consideration.
The water from the spring is very gentle and tasty to the palate when taken in a ladle and drunk.
Since it was in the middle of summer, it was very pleasant to pour it over your body.
You can also make a cold towel by pouring it over a towel to prevent heat stroke.
Ginsui Hamanokawa Spring Water Tourist Exchange Center
https://maps.app.goo.gl/hceYtKphk5h3uot68
Sweets and tofu made from this water are also produced nearby.
They are very tasty!
It is a harsh natural environment, but it also made me feel grateful for water at the moment.
I wondered if there could be a category called “nature".
日本語
福岡市から陸路で2時間半、長崎市から陸路で1時間半、熊本市から船で30分。
水が豊かな都市の1つ、島原があります。
日本では歴史の時間に学習する機会、1991年に大火砕流の災害があったので、知名度は高いと思います。
1792年の火山の災害の地殻変動などの影響で、火山灰層や砂れき層でろ過された地下水は、非常に繊細で良質な湧水となって湧き出ているそうです。
島原市には70ヵ所を超える湧水地があり、その湧水量は一日20万tといわれています。
今回はそのうちの1つを紹介します。
島原湧水群 浜の川湧水
https://maps.app.goo.gl/zh5fVAoywZRymSx4A
ここは4つの区画に分けられ、使い方が決まっています。
水が湧き出る所から近い順番に、食料品を洗うところ、食器を洗うところ、衣料品の選択するところなど用途によって上から順々に水を利用していくような仕組み。
大量に湧き出る水でも、大切に使う。本当に自然環境に配慮したルールを昔から設けています。
湧き出るところからの水を柄杓に取って飲むと非常に優しく口当たりの良いおいしい水です。
真夏でしたから、体にかけるととても気持ち良い。
タオルにかけて冷たいタオルをつくり、熱中症対策もできます。
銀水 浜の川湧水観光交流館
https://maps.app.goo.gl/hceYtKphk5h3uot68
この水を活かしたお菓子や豆腐も近くで作られています。
とても美味しいですよ 
厳しい自然環境ですが、その影響で水のありがたさを感じる瞬間でも有りました。
「自然」というカテゴリが合ってもいいのかなと思いました。
What interesting information, I’m Portuguese and I didn’t know that my country had expanded to Japan at that time, I know that we expanded several territories but I didn’t think that we would reach Japan. Thank you for the information. 
