Lakes are bodies of standing water but not all lakes contain freshwater because they possess only inlets but no outlets.
Why are lakes freshwater, while inland draining endorheic lakes are saline?
When a freshwater lake's natural outflows to the sea are blocked, it is simple for them to transform into endorheic lakes.
Water that has accumulated in a drainage basin typically eventually runs out by rivers or streams on the surface of the Earth or through subsurface diffusion through permeable rock, ending up in the oceans.
However, rain (or any other precipitation) that falls within an endorheic basin cannot flow out; it can only evaporate and seep out of the drainage system. A salt lake or salt pan is often found at the bottom of such a basin.
Endorheic lakes are found in arid areas with high rates of evaporation, no natural outflow, and solitary groundwater aquifers.
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