Blue Water

From Palm Beach to Fort Lauderdale, the Gulf Stream is only a few miles offshore.  We followed the 50 foot contour (approximately), staying only a mile or so off the shore.  A mile or so farther out, the depth drops to a hundred feet (or much more) - here the Gulf Stream has a couple of knot northerly current, so we didn't want to be out there when heading south.

The water is incredibly blue here.  I didn't think that it could be that deep blue in that close to shore, or in water that shallow. I have seen it before, notably in the center of the Gulf Stream, much farther out.

Does anyone know what causes this color?

Beautiful!

Bluewater, in the Atlantic off of Boca Raton, Florida