The capital of Okinawa Prefecture in Japan is Naha, which is also known as Okinawa City. It is the largest city on the island of Okinawa and is located on the East China Sea. Naha is a major port city and is home to many historical sites, including Shuri Castle and the Okinawa Peace Memorial Park. It is also a popular tourist destination, offering a variety of attractions such as beaches, museums, and shopping.