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the land surface which falls off in the lower direction. That is, the drainage divide is a ridge along the high point of the saddle, as well as between the two peaks and so defines the major reference axis. A saddle can vary from a sharp, narrow gap to a broad, comfortable, sway-backed, shallow valley so long as it is both the high point in the sloping faces which descends to lower elevations and the low area between the two (or three or four.) flanking summits. Concurrently, along a different axis, it

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