There are so many different ways, all of which work and all of which have downsides and upsides. I used the Woodland Scenics stuff for my river: what is cool is that you can put it on it layers and stick stuff in it: look closely and you can see the "trout" I put in this fishing hole . . .
![Slide22 Slide22](https://ogrforum.ogaugerr.com/fileSendAction/fcType/0/fcOid/34936194652556126/filePointer/34936194923240130/fodoid/34936194923240122/imageType/MEDIUM/inlineImage/true/Slide22.JPG)
I have two large "lakes" - 96 by 38 inches and 44 by 22 at the extremes, that are just plywood sealed and painted with a oil-based gloss (Rustoleum in cans, mixture of 1/2 blue, 1/2 green, with a smidge of brown) - three coats. It looks like smooth moutain lakes, etc., - the plywood is removeable - these are access hatches int he middle of the layout, etc.
![picture3 picture3](https://ogrforum.ogaugerr.com/fileSendAction/fcType/0/fcOid/34936194652556126/filePointer/34936194923817355/fodoid/34936194923817351/imageType/MEDIUM/inlineImage/true/picture3.jpg)
Another advantage is that I can run boats on the hard surface - the mechanism for the moving boat is about ten inches deep and right under the plywood.
![Slide34 Slide34](https://ogrforum.ogaugerr.com/fileSendAction/fcType/0/fcOid/34936194652556126/filePointer/34936194923240131/fodoid/34936194923240123/imageType/MEDIUM/inlineImage/true/Slide34.JPG)
![picture2 picture2](https://ogrforum.ogaugerr.com/fileSendAction/fcType/0/fcOid/34936194652556126/filePointer/34936194923240132/fodoid/34936194923240124/imageType/MEDIUM/inlineImage/true/picture2.jpg)