That would have come from a natural shift. There are 2 primary sources such as surface water is fresh water Lake. Rivers, streams etc. and from underground water, such as ponds and groundwater, etc.
Which are derived from natural shift has two main sources of fresh water, surface water, such as lakes, rivers, streams and groundwater, as well as water and so on.
Which are derived from nature, 2 main source is the surface water, such as freshwater lakes, rivers, streams, etc., and from groundwater as well. And groundwater.