Ponds, pools, lakes, canals, basins, and rills

Ponds are small water bodies—although exactly how small is subjective. Henry David Thoreau’s Walden Pond in Massachusetts is 62 acres, and “ponds” tend to be seen as bigger entities in the United States. The Ramsar Convention on Wetlands, however, defines the upper size of a pond as 20 acres. Lakes, by contrast, are larger than ponds. Both are freshwater bodies of water, which may be natural or man-made. A pool, on the other hand, is also seen as a “small body of still water usually of natural formation, a small shallow body of any liquid” according to the Shorter Oxford English Dictionary, but there is the suggestion that a pool may be shallow while a pond might be deep. A lake is definitely deep, ...

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