Question: Which river's source mountain is Baikal Mountains and it's mouth is Lena Delta Wildlife Reserve?
SPARQL query:
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
PREFIX onto: <http://dbpedia.org/ontology/>
SELECT DISTINCT ?uri WHERE {?uri onto:sourceMountain <http://dbpedia.org/resource/Baikal_Mountains> . ?uri onto:riverMouth <http://dbpedia.org/resource/Lena_Delta_Wildlife_Reserve>  . ?uri rdf:type onto:River}