OSM tag name=Idjwi matches Idjwi in these Wikidata fields:
Islands of the Democratic Republic of the Congo | place=islet, place=island, boundary=administrative, admin_level |
Lake islands of Africa | place=islet, place=island, boundary=administrative, admin_level |
Populated places in South Kivu | boundary=administrative, landuse=residential, admin_level, place |
Populated places on Lake Kivu | boundary=administrative, landuse=residential, admin_level, place |