Landscapes & nature
行川アイランド
Wikipedia names 行川アイランド as where 2 films and series were filmed; each title’s page links to the sentence that says so. Wikidata records no shoot here yet.

Filmed here, per Wikipedia
Wikipedia says these were filmed in 行川アイランド. Each title’s page links to the sentence that says so.
Filming locations nearby
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Towns & cities
Katsuura
Japan · 9 km north-east
City in Chiba Prefecture, Japan
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Landscapes & nature
Kamogawa Sea World
Japan · 10 km west
Public aquarium
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Towns & cities Kamogawa
Japan · 12 km west
City in Chiba Prefecture, Japan
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Towns & cities
Onjuku
Japan · 13 km north-east
Town in Isumi district, Chiba Prefecture, Japan
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Towns & cities
Isumi
Japan · 21 km north-east
City in Chiba Prefecture, Japan
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Landscapes & nature Ōyama Senmaida
Japan · 23 km west