I hope they are not serious about not overnight anchoring. It will not be good for Culebra the charter industry or cruising boats. I do not know the rational about no overnight on the government moorings. Making people leave the moorings to anchor seems counter intuitive and would cause more harm than good.

Both of these regulations seem to be aimed at the actual beach and shoreline so as to not interfere with the turtles. The second part of this "intertidal zone" is simply the area between low and high tide. It does not specifically exclude anchoring outside that very limited zone.

"The intertidal zone, also known as the foreshore and seashore and sometimes referred to as the littoral zone, is the area that is above water at low tide and under water at high tide (in other words, the area between tide marks)."