The Japanese proper noun 'オオサカ (oosaka)' refers to the city of Osaka, which is a major economic hub and the second-largest metropolitan area in Japan. It is located in the Kansai region on the island of Honshu. Osaka is known for its modern architecture, nightlife, and hearty street food. Example sentences include: I went to Osaka「オオサカに行きました」(おおさかにいきました). Osaka is famous for takoyaki「オオサカはたこやきで有名です」(おおさかはたこやきでゆうめいです).