Ebenezer Reservoir (Q31913072)

• matcher place: Limpopo (relation 349547)
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  [timeout:300][out:json];
  (
      node(around:1000,-23.93744,29.97970)[natural=bay][name];
      way(around:1000,-23.93744,29.97970)[natural=bay][name];
      rel(around:1000,-23.93744,29.97970)[natural=bay][name];
      node(around:1000,-23.93744,29.97970)[natural=water][name];
      way(around:1000,-23.93744,29.97970)[natural=water][name];
      rel(around:1000,-23.93744,29.97970)[natural=water][name];
      node(around:1000,-23.93744,29.97970)[water=lake][name];
      way(around:1000,-23.93744,29.97970)[water=lake][name];
      rel(around:1000,-23.93744,29.97970)[water=lake][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
bay (Q39594)	natural=bay