I departed on a Sunday morning in May from Okinawa's Tomari Port  (see sidebar below) , which was crowded with tourists of different nationalities. I could hear them speaking English, Chinese, French, Korean, and Japanese. Some held snorkeling gear, while others had underwater cameras in hand. And, although they may have spoken different languages, they all had the same thing in mind: crystal-clear blue waters around the Kerama Islands. Often referred to as 'Kerama Blue,' the exceptional color of the ocean has been drawing many tourists to this group of around 20 islands, 24.

https://okinawa.stripes.com/travel/island-hopping-okinawa-3-days-3-islands-300

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