lac de Machilly (Q111621920)

• matcher place: Upper Savoy (relation 7407), Saint-Julien-en-Genevois (relation 1668739)
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• Overpass query: show query – Overpass Turbo

  [timeout:300][out:json];
  (
      node(around:1000,46.25521,6.32684)[subject][~"^(addr:housenumber|.*name.*)$"~".",i];
      way(around:1000,46.25521,6.32684)[subject][~"^(addr:housenumber|.*name.*)$"~".",i];
      rel(around:1000,46.25521,6.32684)[subject][~"^(addr:housenumber|.*name.*)$"~".",i];
      node(around:1000,46.25521,6.32684)[natural=water][name];
      way(around:1000,46.25521,6.32684)[natural=water][name];
      rel(around:1000,46.25521,6.32684)[natural=water][name];
      node(around:1000,46.25521,6.32684)[water=lake][name];
      way(around:1000,46.25521,6.32684)[water=lake][name];
      rel(around:1000,46.25521,6.32684)[water=lake][name];
      node(around:1000,46.25521,6.32684)[water=reservoir][name];
      way(around:1000,46.25521,6.32684)[water=reservoir][name];
      rel(around:1000,46.25521,6.32684)[water=reservoir][name];
  );
  out center tags;

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found a single match candidate

Search criteria from Wikidata

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body of water (Q15324)	natural=water
lake (Q23397)	water=lake
artificial lake (Q3215290)	water=reservoir