Question: What are the outflow of the lakes which also has one of the outflow as Congo River?
SPARQL query:
PREFIX res: <http://dbpedia.org/resource/>
PREFIX prop: <http://dbpedia.org/property/>
PREFIX onto: <http://dbpedia.org/ontology/>
SELECT DISTINCT ?uri WHERE { ?x prop:outflow res:Congo_River . ?x onto:outflow ?uri . }