21.—(1) Every order made by the F143[appropriate Minister] under this Act shall be published in the Irish Oifigiúil as soon as conveniently may be after it is made.

(2) Whenever the F144[appropriate Minister] has made an order under this Act F145[that Minister] may, if and whenever he thinks it expedient so to do, cause the said order or notice of the making thereof to be published at or in the neighbourhood of the foreshore, tidal lands, seashore, or other area to which such order relates and may cause such publication to be effected in all or any of the following ways, that is to say, by advertisement in one or more newspapers circulating in the district in which such area is situated, by the erection of warning notices at or in the neighbourhood of such area, or by any other means.