Okinawa composed by more than 60 islands, is located in between China Taiwan and Kyushu, Japan.  The sea of Okinawa is very clean. A large number of coral reefs grow underwater.  Looking from the surface of the water, one can see the depth of water of different colors. Sometimes the sea is emerald green, and sometimes as blue as the sky. The color change creates extraordinary beauty as watercolor rendering. Driving along the seaside road, one side the sea, the other side the mountain, never let people get tired.