What is {coordinate location} of {Douro} that is {applies to part} is {river mouth} ?
Where is the mouth of the Doruro River?
What are the coordinates of Douro's river mouth?
SELECT ?z WHERE { ?k property:applies_to_part resource:river_mouth . resource:Douro property:coordinate_location ?k . ?k property:coordinate_location ?z }
select distinct ?obj  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q14299> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P625> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> ?obj .
?statement <http://www.wikidata.org/entity/P518> <http://wikidata.dbpedia.org/resource/Q1233637>
} 

SELECT ?obj WHERE { wd:Q14299 p:P625 ?s . ?s ps:P625 ?obj . ?s pq:P518 wd:Q1233637 }