It has a mean breadth of about NUMBER@1 km -LRB- NUMBER@2 nm , NUMBER@3 mi -RRB- , although the LOCATION@1 , through which it connects at the south with the LOCATION@2 , is only NUMBER@4 nautical miles wide -LRB- NUMBER@5 km -RRB- .

The Strait of LOCATION@3 joins the LOCATION@4 and the LOCATION@2 and is only NUMBER@2 to NUMBER@3 km wide .
