tell me the port city with the highest point that starts with lettter "b" in Tibidabo.
SELECT DISTINCT ?sbj ?sbj_label WHERE { ?sbj wdt:P31 wd:Q2264924 . ?sbj wdt:P610 wd:Q658271 . ?sbj rdfs:label ?sbj_label . FILTER(STRSTARTS(lcase(?sbj_label), 'b')) . FILTER (lang(?sbj_label) = 'en') } LIMIT 25 
port settlement: Q2264924 tibidabo: Q658271