Question: Rivers from which countries flow into the Caspian?
SPARQL query: SELECT DISTINCT ?uri WHERE { ?x <http://dbpedia.org/ontology/riverMouth> <http://dbpedia.org/resource/Caspian_Sea> . ?x <http://dbpedia.org/ontology/sourceCountry> ?uri  . ?x <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://dbpedia.org/ontology/River>}
Answer: The source countries of the rivers that flow into the Caspian are [Kazakhstan, Russia, Turkey, Stavropol Krai, North Ossetia-Alania, Chechnya, Kabardino-Balkaria, Dagestan, Georgia (country), Iran, Azerbaijan, Astrakhan Oblast].