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Nadir (topography) : ウィキペディア英語版 | Nadir (topography)
In topography, a nadir is a point on a surface that is lower in elevation than all points immediately adjacent to it. Mathematically, a nadir is a local minimum of elevation. A nadir may be the lowest point of a dry basin or depression, or the deepest point of a body of water or ice. The nadir of a body of water is often called a "deep", as in the Challenger Deep, the nadir of the Earth's oceans. ==See also==
*Depression (geology) *Endorheic basin *Geoid *List of places on land with elevations below sea level *Maxima and minima *Summit (topography) (antonym) *Topography
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