Some of the world's strangest lakes are filled not with water but with asphalt, also known bitumen, the same material that roads are paved with. The great majority of asphalt that is used today is derived from petroleum, but asphalt is also found in concentrated form in nature.
Sometimes, asphalt lakes seep from the ground and creates large puddles known as tar pits or asphalt lakes. Asphalt is also known to erupt in underwater volcanoes, but these are relatively rare and were discovered only in 2003.
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