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Places artificially created such as tunnels, mines, basements, and dug holes, or places under water, or existing temporarily as a result of ebbing of sea tide etc., are not included. Places where seawater and rainwater is pumped away are included. Fully natural places below sea level require a dry climate; otherwise, rain would exceed ...
sea level: 41 500 ft 150 m 38 2,405 ft 733 m Alaska [g] Denali (federally Mount McKinley) [6] [h] 1 20,310 ft 6190.5 m Gulf of Alaska, Bering Sea, and Arctic Ocean: 3 sea level: 15 1,900 ft 580 m 1 20,310 ft 6190.5 m
Holme Fen, specifically Holme Posts, is believed to be the lowest land point in Great Britain at 2.75 metres (9.0 ft) below sea level. [ 9 ] [ 10 ] Before drainage, the fens contained many shallow lakes, of which Whittlesey Mere was one of the largest.
Tunnel datum is a datum based on an ordnance datum and used in designing tunnels which pass below sea level. for the London Underground, a tunnel datum of ODN −100 m is used; [7] thus a depth of −60 m AOD is 40 m ATD (above tunnel datum) for the Channel Tunnel, a tunnel datum of ODN −200 m is used; [8] thus a depth of −60 m is 140 m ATD
The Slave River (which drains Lake Athabasca) flows from northeastern Alberta into the Northwest Territories and is Alberta's lowest point at the N.W.T. border (152 m (499 ft) above sea level). However, the False Creek Tunnel, part of the Canada Line rail-based transit system in Vancouver , at 29 m (95 ft) below sea level, is the lowest ...
The Fens are very low-lying compared with the chalk and limestone uplands that surround them – in most places no more than 10 metres (33 ft) above sea level. As a result of drainage and the subsequent shrinkage of the peat fens, many parts of the Fens now lie below mean sea level .
Death Valley's Badwater Basin is the point of lowest elevation in North America, at 282 feet (86 m) below sea level. [1] It is 84.6 miles (136.2 km) east-southeast of Mount Whitney – the highest point in the contiguous United States , with an elevation of 14,505 feet (4,421 m). [ 4 ]
A common and relatively straightforward mean sea-level standard is instead a long-term average of tide gauge readings at a particular reference location. [1] The term above sea level generally refers to the height above mean sea level (AMSL). The term APSL means above present sea level, comparing sea levels in the past with the level today.