Chhera island ( , `` Chhera Dwip '' ) , also called Cheradia Island or Cheridia Island , is an extension of St. Martin 's Island but divided by sea during tides .
Chhera island ( Bengali : Chhera Dwip ) , also called Cheradia Island or Cheridia Island , is an extension of St. Martin 's Island in Bangladesh , but cut off from it by sea during high tides .