query: SELECT ?item ?area ?unit ?resultSI  WHERE {
    ?item wdt:P31 wd:Q23397 .
    ?item wdt:P17 wd:Q211 .
    ?item p:P2046 ?area_statement .
    ?area_statement psv:P2046 ?area_node .
    ?area_node wikibase:quantityAmount ?area .  
    ?area_node wikibase:quantityUnit ?unit .
    ?unit wdt:P2370 ?conversionSI . 
    BIND(?area*?conversionSI AS ?resultSI)
  }
  ORDER BY DESC(?resultSI)