Swartwater (Q34873235)

• matcher place: Mpumalanga (relation 349556)
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  [timeout:300][out:json];
  (
      node(around:1000,-27.10056,30.87083)[fishing][~"^(addr:housenumber|.*name.*)$"~".",i];
      way(around:1000,-27.10056,30.87083)[fishing][~"^(addr:housenumber|.*name.*)$"~".",i];
      rel(around:1000,-27.10056,30.87083)[fishing][~"^(addr:housenumber|.*name.*)$"~".",i];
      node(around:1000,-27.10056,30.87083)[waterway][~"^(addr:housenumber|.*name.*)$"~".",i];
      way(around:1000,-27.10056,30.87083)[waterway][~"^(addr:housenumber|.*name.*)$"~".",i];
      rel(around:1000,-27.10056,30.87083)[waterway][~"^(addr:housenumber|.*name.*)$"~".",i];
      node(around:1000,-27.10056,30.87083)[leisure=fishing][~"^(addr:housenumber|.*name.*)$"~".",i];
      way(around:1000,-27.10056,30.87083)[leisure=fishing][~"^(addr:housenumber|.*name.*)$"~".",i];
      rel(around:1000,-27.10056,30.87083)[leisure=fishing][~"^(addr:housenumber|.*name.*)$"~".",i];
      node(around:1000,-27.10056,30.87083)[natural=water][name];
      way(around:1000,-27.10056,30.87083)[natural=water][name];
      rel(around:1000,-27.10056,30.87083)[natural=water][name];
      node(around:1000,-27.10056,30.87083)[sport=fishing][~"^(addr:housenumber|.*name.*)$"~".",i];
      way(around:1000,-27.10056,30.87083)[sport=fishing][~"^(addr:housenumber|.*name.*)$"~".",i];
      rel(around:1000,-27.10056,30.87083)[sport=fishing][~"^(addr:housenumber|.*name.*)$"~".",i];
      rel(around:1000,-27.10056,30.87083)[type=waterway][~"^(addr:housenumber|.*name.*)$"~".",i];
  );
  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
watercourse (Q355304)	waterway
river (Q4022)	waterway=river, leisure=fishing, type=waterway
stream (Q47521)	waterway