See the longstanding maps package for documentation on this
function. The functions world.land, world.color and in.land.grid have
been depreciated but can be recovered from versions of fields 6.7.1 or
older.
world()
# add the USUS( add=TRUE,col="blue")
world( fill=TRUE) # land filled in black ## Western Europeworld( xlim=c(-10,18),ylim=c(36,60),fill=TRUE, col="darkgreen",
border="green1")