It is midway between the Lower Mainland of BC and Vancouver Island , and has a population of 1071 .
Mayne Island is a 21 - square - kilometre ( 8.1 sq mi ) island in the southern Gulf Islands chain of British Columbia .
It is midway between the Lower Mainland of British Columbia and Vancouver Island , and has a population of 1071 .
Mayne Island is a 21 - square - kilometre ( 8.1 sq mi ) island in the southern Gulf Islands chain of British Columbia .