found: Work cat.: 2016589703: Japan. Kaigunshō. Suirobu. Dai Ryūkyū Naha-kō no zu, 1873:map recto (那覇港 = Naha-kō)
found: GEOnet, Nov. 22, 2016(Naha Kō (approved); harbor; Japan, Okinawa; 26°13'40"N, 127°39'58"E; non-roman script: 那覇港; variant: Naha-gawa, Naha-kō, Naha-wan, Tomari-kō)
found: Wikipedia, Nov. 22, 2016(Naha-kō; Naha-kō is a harbor in Naha-shi, Okinawa)
found: Website of Naha Port Authority, www.nahaport.jp, Nov. 23, 2016(Naha Port is located on Okinawa prefecture's main island, situated 600 kilometers southwest of Japan's main island and in the middle of the East China Sea)
notfound: Columbia Gazetteer;Merriam-Webster's Geographical Dictionary