SELECT DISTINCT ?uri WHERE { ?x <http://dbpedia.org/ontology/leftTributary> <http://dbpedia.org/resource/Krapanski_Potok> . ?x <http://dbpedia.org/ontology/source> ?uri . }
Where does the river begin whose left tributary is Krapanski Potok?
SELECT DISTINCT ?f WHERE { ?g property:source ?f . . ?g property:left_tributary resource:Krapanski_Potok }
Croatia, Piaan
The source place of the river whose left tributary is Krapanski Potok is [Croatia, Piaan].
The source of the river, whose left tributary is the Krapan Pond, is [Croatia, Piaan].