Question: Asia Cosmopolitan Awards is an international award established by Economic Research Institute for ASEAN and East Asia (ERIA) in the context of commemoration of the 1300-year anniversary in 2010 of Heijo-kyo, (ancient capital of Japan located in present-day Nara), Japan is a sovereign island nation, in which eastern subregion of the Asian continent?
Sentence (from "Japan"): Located in the Pacific Ocean, it lies off the eastern coast of the Asian mainland and stretches from the Sea of Okhotsk in the north to the East China Sea and Taiwan in the southwest.
Relevant evidence: No