Doraemon: Nobita's Great Adventure in the South Seas (1998)
Original title: 映画ドラえもん のび太の南海大冒険
Doraemon: Nobita's Great Adventure in the South Seas is a 1998 Japanese-language animation movie directed by Tsutomu Shibayama, with a running time of 1h 31m. It stars Nobuyo Oyama, Noriko Ohara and Michiko Nomura.
Nobita coaxes his friends to join him for a treasure hunt but an eerie event transports them to the past. However, their hunt for treasure is not easy as they come face-to-face with pirates.