LEEUWIN CURRENT The Leeuwin Current is most predominant during May-August, with a surface current generally less than 1•0 kn. It has an average width of 30 nautical miles and extends to a depth of approximately 200 metres, carrying warm, low salinity water from the North West Shelf area along the continental slope south to Cape Leeuwin and then east into the Great Australian Bight. For details of currents generally see Australia Pilot Vol I NP 13.