Landscapes & nature
Kleifarvatn
Lake
Wikipedia names Kleifarvatn as where 1 film or series was filmed; its page links to the sentence that says so. Wikidata records no shoot here yet.

Filmed here, per Wikipedia
Wikipedia says these were filmed in Kleifarvatn. Each title’s page links to the sentence that says so.
Filming locations nearby
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Landscapes & nature Reykjanes
Iceland · 7 km west
Peninsula in Iceland
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Towns & cities Hafnarfjörður
Iceland · 11 km north
Town of Iceland
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Landscapes & nature Heiðmörk
Iceland · 18 km north-east
Conservation area in Reykjavík, Iceland
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Towns & cities
Garðabær
Iceland · 18 km north
Town in Iceland
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Landscapes & nature Blue Lagoon
Iceland · 24 km west
Lake in Iceland
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Towns & cities Reykjavík
Iceland · 25 km north
Capital and largest city in Iceland