Osaka Castle is a castle from the Azuchi-Momoyama period to the edo period, which was in Otsaka (present Osaka Castle Park) in setojin-ku Tokyo.
Another name is kinshiro or nishiki, because Osaka was revised as Osaka in modern times, it sometimes is written as Osaka Castle.
Dotonbori is a canal which is about 2.5 km in length connects kisatsu.and higashi-harbor. which runs in Osaka shi Osaka prefecture and the town name in chook Osaka.
Although sometimes abbreviated as donburi but it has not been established yet. It is not abbreviated in the local but it is expressed as dotombori.