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Depth Notes / references 1= Caspian Sea and its shores: Azerbaijan, Russia, and Kazakhstan: −28 m (−92 ft) Caspian Depression: 1= Baku: Azerbaijan: −28 m (−92 ft) lowest lying national capital in the world, Caspian Depression: 3: Atyrau Airport: Kazakhstan: −22 m (−72 ft) lowest international airport, Caspian Depression: 4 ...
The lowest (from surface) artificially made point with open sky may be the Bingham Canyon Open Pit Copper Mine, Utah, United States, at a depth of 1,200 m (3,900 ft) below surface level. The lowest point underwater is the 10,685 m (35,056 ft)-deep (as measured from the subsea wellhead ) oil and gas well drilled on the Tiber Oil Field in the ...
There are about 50,000 km (31,000 mi) of oceanic trenches worldwide, mostly around the Pacific Ocean, but also in the eastern Indian Ocean and a few other locations. The greatest ocean depth measured is in the Challenger Deep of the Mariana Trench , at a depth of 10,994 m (36,070 ft) below sea level .
Sonar mapping of the Challenger Deep by the DSSV Pressure Drop employing a Kongsberg SIMRAD EM124 multibeam echosounder system (26 April – 4 May 2019). The Challenger Deep is a relatively small slot-shaped depression in the bottom of a considerably larger crescent-shaped oceanic trench, which itself is an unusually deep feature in the ocean floor.
In geography, hydrography, and fluvial geomorphology, a thalweg or talweg (/ ˈ t ɑː l v ɛ ɡ /) is the line or curve of lowest elevation within a valley or watercourse. [1] Its vertical position in maps is the nadir (greatest depth, sounding ) in the stream profile .
Common chart datums are lowest astronomical tide (LAT) [1] and mean lower low water (MLLW). In non-tidal areas, e.g. the Baltic Sea , mean sea level (MSL) is used. [ 2 ] A chart datum is a type of vertical datum and must not be confused with the horizontal datum for the chart.
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From Louisville, the river loses depth very gradually until its confluence with the Mississippi at Cairo, Illinois, where it has an approximate depth of 19 feet (6 m). Water levels for the Ohio River from Smithland Lock and Dam upstream to Pittsburgh are predicted daily by the National Oceanic and Atmospheric Administration 's Ohio River ...