Question: Where does the river begin whose left tributary is Krapanski Potok?
SPARQL query: SELECT DISTINCT ?uri WHERE { ?x <http://dbpedia.org/ontology/leftTributary> <http://dbpedia.org/resource/Krapanski_Potok> . ?x <http://dbpedia.org/ontology/source> ?uri  . }
Answer: The source place of the river whose left tributary is Krapanski Potok is [Croatia, Pićan].