Tell me the geographic region that is located in the terrain feature of Oceania and contains the word melanesia in it's name?
SELECT DISTINCT ?sbj ?sbj_label WHERE { ?sbj wdt:/instance of/ wd:/geographic region/ . ?sbj wdt:/located in/on physical feature/ wd:/Insular Oceania/ . ?sbj rdfs:label ?sbj_label . FILTER(CONTAINS(lcase(?sbj_label), 'melanesia')) . FILTER (lang(?sbj_label) = 'en') } LIMIT 25 