Question: How many cities are around the sea in which the ionian sea flows?
SPARQL query:
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
PREFIX prop: <http://dbpedia.org/property/>
PREFIX onto: <http://dbpedia.org/ontology/>
SELECT DISTINCT COUNT(?uri) WHERE { <http://dbpedia.org/resource/Ionian_Sea> onto:outflow ?x . ?x prop:cities ?uri  . ?x rdf:type onto:Sea}