Most of the color of the sea is blue. The cause of the blue sea is because only the turquoise light can be transmitted inside,

then spread, and transmitted back out of the water without being absorbed. The salt content contained in the sea also affects the blueness of the sea.

The higher the salt content in the sea, the more blue the color of the sea. Reflection of the color of the sky also affects the color of the sea, but is very small