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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.
The maximum known depth is 10,984 ± 25 metres (36,037 ± 82 ft; 6,006 ± 14 fathoms; 6.825 ± 0.016 mi) at the southern end of a small slot-shaped valley in its floor known as the Challenger Deep. [1] The deepest point of the trench is more than 2 km (1.2 mi) farther from sea level than the peak of Mount Everest. [a]
The Strait of Dover (French: Pas de Calais), at the Channel's eastern end, is its narrowest point, while its widest point lies between Lyme Bay and the Gulf of Saint Malo, near its midpoint. [3] Well on the continental shelf, it has an average depth of about 120 m (390 ft) at its widest; yet averages about 45 m (148 ft) between Dover and Calais ...
Of all countries, Lesotho has the world's highest low point at 1,400 metres (4,593 ft). Other countries with high low points include Rwanda 950 metres (3,117 ft) and Andorra 840 metres (2,756 ft). Countries with very low high points include Maldives 5 metres (16 ft), Tuvalu, 5 metres (16 ft) and the Marshall Islands 10 metres (33 ft). These ...
The normal high-water mark is 1.17 feet (0.36 m) above the datum (601.1 ft or 183.2 m). In the summer of 1985, Lake Superior reached its highest recorded level at 2.33 feet (0.71 m) above the datum. [27] 2019 and 2020 set new high-water records in nearly every month. [27] The lake's lowest levels occur in March and April.
From east to west, these are: Nero Deep, which was the deepest known spot in the ocean from 1899 to 1927 at 9,660 m (31,690 ft); Sirena Deep, the third deepest measured point at 10,714 m (35,151 ft); and Challenger Deep, the deepest point at 10,902 to 10,929 m (35,768 to 35,856 ft).
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 Gulf of Mexico. The wellhead of this well is an additional 1,259 m (4,131 ft) underwater, for a total distance of 11,944 m (39,186 ft) as measured from sea level.
The new lock chambers feature sliding gates, doubled for safety, and are 427 m (1,400 ft) long, 55 m (180 ft) wide, and 18.3 m (60 ft) deep. This allows the transit of vessels with a beam of up to 49 m (160 ft), an overall length of up to 366 m (1,200 ft) and a draft of up to 15 m (49 ft), equivalent to a container ship carrying around 12,000 ...