Although not all are on top a mountain or something, but when mountains are formed by pressure pushing it up,
It does for perfect paths for water to follow up.
Think of it like holding a balloon filled with water, when you squeeze an area,
It will disform and create a lump (mountain)
If you squeeze too much, the surface breaks and the water will come out.
Then water follows the path down with least resistance, other sources of water (spring, rain, melt water,…) do the same, all converge towards the same depressions in the surface creating rivers.
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