What is {coordinate location} of {Kasai River} that is {applies to part} is {river source} ?
What are the coordinates of the source of the Kasai River?
SELECT ?obj WHERE { wd:Q186541 p:P625 ?s . ?s ps:P625 ?obj . ?s pq:P518 wd:Q7376362 }
select distinct ?obj  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q186541> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P625> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> ?obj .
?statement <http://www.wikidata.org/entity/P518> <http://wikidata.dbpedia.org/resource/Q7376362>
} 

Tell me the coordinates of the source of the Kasai River?