Coast is missing?

The coastline appears to be missing or broken in the Bunbury area in Western Australia, a section of the map is rendered the same colour as the ocean and there’s no clear distinction of where the land ends and the ocean begins. Can someone fix it up or maybe give me a clue as to what to look for? The coastline line appears to be there so maybe it’s something that identifies the landmass.

Thanks

can link to the map where you’re seeing this problem?
http://wiki.openstreetmap.org/wiki/Browse#Linking_to_Maps