Law 305 of 1968 states the following:
"Art. 49.- Est? sujeta a la navegaci?n mar?tima, as? como a cualquier otro uso p?blico que fijen los reglamentos del Poder Ejecutivo, la faja de terreno denominada Zona Mar?tima, o sea la que se halla paralela al mar, de sesenta metros de ancho, medidos desde la l?nea a que asciende la pleamar ordinaria hacia la tierra y que abarca, salvo los derechos de propiedad que al presente existan, todas las costas y playas del territorio dominicano. Dicha zona comprende los r?os y corrientes, lagunas y lagos navegables o flotables hasta donde se encuentren bajo la acci?n de las mareas. La zona mar?tima forma parte del dominio p?blico, as? como tambi?n la zona de las mareas, o sea la porci?n de tierra que se halla entre la l?nea de pleamar y la bajamar."
?Art. 49.- It will be subject to maritime navigation, as well as to any other public use established by Executive regulation, the strip of land called the ?Maritime Zone,? meaning that which is parallel to the sea, 60 meters wide, measured from the line reached by the normal high tide inland, and comprising, except for those property rights in existence, all the Dominican coast and beaches. Said zone comprises rivers and currents, navigable lagoons and lakes up to the line where they are affected by the tides. The maritime zone is part of the public domain, as well as the zone of the tides, that is, the portion of land found between the high water and low water marks.?
It is interesting to note that the original provision establishing a Maritime Zone was enacted in 1920 by Vice-Admiral Thomas Snowden, Military Governor during the American occupation of 1916 to 1924. The width was originally 5 meters but has been changed over the years reaching the present 60 meters in 1968.
The permit you need is not only from Medio Ambiente or the Navy but a special permit granted by Decree by the President.