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A pond is a body of water that is smaller than a lake. The method of defining ponds and lakes is quite controversial. In general, ponds are small enough to be used without the use of boats. Another definition is that people can safely traverse without being flooded by water, or the water can reach the bottom of the pond with shallow sunlight. A pond can also refer to a manually constructed pool. Usually the ponds are filled with no ground. They rely on natural groundwater sources and rainwater or artificially divert water into the pool. Because of this, the closed ecosystem of ponds is different from lakes. The pool water is green in many cases because there are many algae in it. In Asia, ponds are common in courtyards and communities; in Europe, ponds are often found in castles; in Canada, water is abundant and ponds are common.