What is {coordinate location} of {Danube} that is {applies to part} is {river mouth} ?
In which place, the river mouth that's part of Danube existed?.
Where is the river mouth located that's part of Danube?
SELECT ?p WHERE { ?k property:coordinate_location ?p . ?k property:applies_to_part resource:river_mouth . resource:Danube property:coordinate_location ?k }
select distinct ?obj  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q1653> .
?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:Q1653 p:P625 ?s . ?s ps:P625 ?obj . ?s pq:P518 wd:Q1233637 }