The surface of the sea is equidistant from the center of the earth and forms the deepest surface in the world. The lowest parts of the mountains are found where they join their valleys, and in the extreme depths of these valleys are the rivers which formed them and which reach their ultimate depth in their concourse into the ultimate stream, where they lose their forms and names; and the deepest part of the ultimate stream is the sea where the wandering kindred streams find repose.
-Leonardo da Vinci
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