There’s also water inside the earth, the lake is just a low point. Think of the Earth like a sponge that is constantly getting saturated with water (from rain). It keeps absorbing until it can’t hold any more, then the excess water will start to flow right out of the sides of hills etc as small springs which eventually coalesce into creeks and rivers and then flow into lakes. If you looked at a sponge very close-up and see water collected in one of the indentations, that is a lot like a lake.
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