SELECT DISTINCT COUNT(?uri) WHERE { ?x <http://dbpedia.org/ontology/officialLanguage> <http://dbpedia.org/resource/English_language> . ?uri <http://dbpedia.org/ontology/sourceCountry> ?x . ?uri <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://dbpedia.org/ontology/River>}
How many rivers start in an English speaking country?
SELECT DISTINCT COUNT ( ?c ) WHERE { ?c rdf:type ontology:River . ?r property:official_language resource:English_language . ?c property:source_country ?r }
529
There are [529] rivers whose source country's official language is English.
There are [529] riders whose official language is English.