Question: Which source of river Raa is the sovereign state of Adriatic sea ?
SPARQL:
 SELECT DISTINCT ?uri WHERE { <http://dbpedia.org/resource/Raša_(river)> <http://dbpedia.org/ontology/source> ?uri. <http://dbpedia.org/resource/Adriatic_Sea> <http://dbpedia.org/ontology/country> ?uri}