decently large at 4096x768
water level should be set to -8
(http://i199.photobucket.com/albums/aa131/AEObikes/simutrans/River_delta.png)
http://dl.dropbox.com/u/17111233/River%20Delta.rar
sorry, size is 4096x768, not 3072x768
Nice map, I have added it to the Simutrans Maps website in the fantasy maps section.
Oh, it seems like that time for reloading of my maps archive came earlier I thought. :D