Where was Still the Water filmed?
2014 film by Naomi Kawase
Still the Water (2014) was filmed in Amami Ōshima, Amami, Kasari and Oshima Kita High School, 4 places named in its Wikipedia article, in Japan. Wikidata records no filming location for it at all, so the article is the only recorded source. Each place says where its claim comes from.
Places per Wikipedia's article
The Wikipedia article names 4 places. Each links to the sentence that says so.
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Landscapes & nature
Amami Ōshima
Japan
Island within Ryukyu Islands
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Towns & cities Amami
Japan
City in Kagoshima prefecture, Japan
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Towns & cities
Kasari
Japan
Dissolved municipality in Ōshima district, Kagoshima prefecture, Japan
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Landmarks & buildings
Oshima Kita High School
Japan
Prefectural High School in Amami City, Japan