OSM tag name=大沼 matches 大沼 in these Wikidata fields:
OSM tag name:ja=大沼 matches 大沼 in these Wikidata fields:
OSM tag name:en=Lake Onuma matches Ōnuma in these Wikidata fields:
OSM tag name:en=Lake Onuma matches Lake Ōnuma in these Wikidata fields: