Where was 1 Litre no Namida filmed?
2005 Japanese television drama
1 Litre no Namida (2005–) was filmed in The University of Tokyo Hospital, 1 place named in its Japanese Wikipedia’s 撮影協力 section, in Japan. Wikidata records no filming location for it at all, so the article is the only recorded source. Each place says where its claim comes from.
Places per Japanese Wikipedia's 撮影協力 section
Japanese Wikipedia’s 撮影協力 section names 1 place. Each links to the sentence that says so.