Where was Summer Lovers filmed?
1982 film by Randal Kleiser
Summer Lovers (1982) was filmed in Crete, Santorini, Delos, Mykonos and Akrotiri, 5 places named in its Wikipedia article, in Greece. Wikidata itself records the shoot only as Greece. Each place says where its claim comes from.
Places per Wikipedia's article
The Wikipedia article names 5 places. Each links to the sentence that says so.
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Landscapes & nature
Mykonos
Greece
Island in the Cyclades, Greece
“Scenes were also filmed on the islands of Crete, Delos, and Mykonos.” Wikipedia
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Landscapes & nature
Crete
Greece
Island of Greece
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Landscapes & nature
Santorini
Greece
Greek island in the Cyclades
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Towns & cities
Delos
Greece
Island in Greece with famous Apollo sanctuary
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Towns & cities
Akrotiri
Greece
Bronze Age settlement on the volcanic Greek island of Santorini (Thera)
Recorded only at country level
Also filmed in Greece, but the exact places are not known, so they are not on the map.
Filming locations that are mapped there: Greece