3. Whenever it shall appear to the local revenue-authorities that an island has been thrown up in a large and navigable river liable to be taken possession of by Government (under clause 3, section 4, of Regulation XI of 1825), the local revenue-authorities shall take immediate possession of the same for Government, and shall assess and settle the land according to rules in force in that behalf, reporting their proceedings forthwith ¹[for the approval of the Board of Land Administration], whose order thereupon, in regard to the assessment, shall be final:Provided, however, that any party aggrieved by the act of the revenue-authorities in taking possession of any island as aforesaid shall be at liberty to contest the same by a regular suit in the Civil Court.