How many {island of location} are to/by {Saint Vincent} ?
How many islands are located by Saint Vincent?
SELECT (COUNT(?sub) AS ?value ) { ?sub wdt:P5130 wd:Q379656 }
SELECT (COUNT(?sub) AS ?subs ) {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> ?sub .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P5130> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> http://wikidata.dbpedia.org/resource/Q379656 .
} 

How many islands are there near Saint Vincent?