I use
generate-sea: 
extend-sea-sectors,close-gaps=6000,floodblocker,land-tag=natural=background

In the polygon style, I'm specifying a land-tag "natural=background" and not 
"natural=land" because the last one is often used to make islands in a lake. 
The background must get the second lowest draw order (sea is the lowest) so  if 
you use natural=land as background those islands in a lake are rendered under 
the lake.

BTW I have noticed in the default style there isn't a tag for natural=land or a 
another background. If you don't specify a background, this will cause 
'ghosting' problems in Mapsource. When you zoomed in or out, it disappears. 
This effect only shows up in the later versions of Mapsource (6.16.x). You 
don't see it in Basecamp.


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