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"): Japan (Japanese: 日本 "Nippon" ] or "Nihon" ] ; formally 日本国 "  " or "Nihon-koku", meaning "State of Japan") is a sovereign island nation in East Asia.
Relevant evidence: Yes