What is a pond?
A pond is a small area of still, fresh water. It is different from a river or a stream because it does not have moving water and it differs from a lake because it has a small area and is no more than around 1.8m deep. Some ponds are formed naturally, filled either by an underwater spring, or by rainwater - sometimes known as 'dewponds'; other ponds are man-made.
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Source: Young People's Trust for the Environment