SELECT DISTINCT COUNT(?uri) WHERE { ?x <http://dbpedia.org/ontology/riverMouth> <http://dbpedia.org/resource/Caspian_Sea> . ?x <http://dbpedia.org/ontology/sourceCountry> ?uri . ?uri <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://dbpedia.org/ontology/Country>}
In how many countries do the rivers start which end at the Caspian Sea?
SELECT DISTINCT COUNT ( ?h ) WHERE { ?e property:river_mouth resource:Caspian_Sea . ?h rdf:type ontology:Country . ?e property:source_country ?h }
15
There are [15] source countries of the rivers whose mouth is Caspian Sea.
There are [15] river countries whose estuary is in the Caspian Sea.
There are [15] source country are there, of the rivers whose river mouth is location .
There are [15] countries in the world where the estuary is located.