Sentence:  One of the main features of Australia′s ‘Pacific Solution' is that it involves the use of the Australian Navy to prevent boat people from landing on mainland Australia. The boat people are then transferred to <WSD>detention centres</WSD> on offshore Australian Territories which have been excised from the country′s migration zone where regular immigration rules are in application.78 <WSD>Detention centres</WSD> for such transfers have also been set up on Nauru and Manus Island (Papua New Guinea).79 
Meaning of the word marked with <WSD> tags:  An immigration detention facility; a facility in which people who have attempted to enter Australia without prior authorisation are detained, pending a decision on whether they are to be accepted as refugees or returned to their country of origin.