The bay is 21 km ( 13 mi ; 11 nmi ) long .
The bay has a maximum breadth of 2.2 km ( 1.4 mi ; 1.2 nmi ) and the depth is between 7 and 28 metres ( 23 and 92 ft ) .
The bay is 21 km ( 13 mi ; 11 nmi ) long and has a maximum breadth of 2.2 km ( 1.4 mi ; 1.2 nmi ) and the depth is between 7 and 28 metres ( 23 and 92 ft ) .