Okinawa is Japan's southernmost prefecture, an archipelago of over 160 islands scattered across the East China Sea with a subtropical climate and unique Ryukyuan cultural heritage. Known for its crystal-clear turquoise waters, white sand beaches, and ancient castle ruins, Okinawa offers a distinctly different experience from mainland Japan. The islands are also celebrated worldwide for the extraordinary longevity of their residents and a laid-back lifestyle shaped by centuries of trade and cultural exchange.