You can silicone in a smooth divider or silicone together large rocks or smooth decor as the land. You can make a ridge with the rocks on top as a border, kind of like an slightly elevated box, you can also use foam to create boundaries. Great stuff foam and/or styrofoam coated in silicone or grout. Lots of options.
This is my favorite site for some ideas... http://www.lizard-landscapes.com
Hope this helps![]()





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