query: #defaultView:Map
  SELECT ?river ?riverLabel ?location
  WHERE
  {
    ?river wdt:P31/wdt:P279* wd:Q355304; # watercourse; includes a few creeks – use wd:Q4022 for rivers only
           wdt:P30 wd:Q51.
    OPTIONAL { ?river wdt:P625 ?location. }
    SERVICE wikibase:label { bd:serviceParam wikibase:language "en". }
  }