law: Indian Ports Act, 1908
  5. Alteration of limits of ports 
  (1) The 2[Government] may, 10[***] subject
  
  to any rights of private property, alter the limits of any port in which this
  
  Act is in force.
   11  [Explanation.- For the removal of doubts, it is hereby
  
  declared that the power conferred on the Government by this sub-section
  
  includes the power to alter the limits of any port by uniting with that port
  
  any other port or any part of any other port.]
  (2) When the 2[Government] alters the limits of a
  
  port under sub-section (1), it shall declare or describe, by notification in
  
  the Official Gazette, and by such other means, if any, as it thinks fit, the
  
  precise extend of such limits.