Question: Name a  river with source country as Zambia and source location as Ikelenge  District?
SPARQL query:
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
PREFIX prop: <http://dbpedia.org/property/>
PREFIX onto: <http://dbpedia.org/ontology/>
SELECT DISTINCT ?uri WHERE {?uri onto:sourceCountry <http://dbpedia.org/resource/Zambia> . ?uri prop:sourceLocation <http://dbpedia.org/resource/Ikelenge_District>  . ?uri rdf:type onto:River}