What is <reservoir created> of <Lake Volta> ?
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Which  reservoir created for  Lake Volta ?
SELECT DISTINCT ?z WHERE { ?z property:reservoir_created resource:Lake_Volta }
select distinct ?answer where { ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject>  ?answer. ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P4661> . ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> <http://wikidata.dbpedia.org/resource/Q201679>. }
select distinct ?answer where { ?answer wdt:P4661 wd:Q201679}
Akosombo Dam