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Otjikoto Lake
Otjikoto Lake is the smaller of only two permanent natural lakes in Namibia. It is a sinkhole lake that was created by a collapsing karst cave. It is located from Tsumeb and only a few meters from the main road B1. The diameter of the lake is ; its depth is undetermined. According to a Namibian tourism information organisation,〔(【引用サイトリンク】title=Lake Otjikoto A Window Into The Past )〕 "the depth varies from sixty two meters at the side to seven meters in the centre, and in some places leading off from the side depths of one hundred meters have been recorded", while an article in the Allgemeine Zeitung explains the depth problem: "the lake tapers into a lateral cave system making it impossible to determine its exact depth, estimated to be in access (''sic'') of 142 meters."
The lake was known to the San under the name ''Gaisis'' ("ugly"). When the Herero moved into the area, they named it ''Otjikoto'' (Otjiherero: "deep hole"). Namibia's Oshikoto Region, in which the lake is situated, is an alternative spelling of ''Otjikoto'' and derives its name from that of the lake. The first Europeans to discover the lake were Francis Galton and Carl Johan Andersson, who during their search for Lake Ngami came upon Otjikoto Lake in 1851.〔(【引用サイトリンク】title=Otjikoto Lake & Lake Guinas )〕
The lake was a dumping ground for German ''Schutztruppe'' during World War I; in June 1915 German troops dumped war materials in the lake before surrendering to stop the South African and British troops from using them. Most of the larger pieces have been recovered and are displayed in Tsumeb Museum, but at least two cannons, along with quantities of ammunition, are still in the lake〔''Monty Halls and the Kaiser's Gold'', Channel 5 (UK), 25 Nov 2013〕 and can be viewed with a special diving permit. According to legend, the Germans also dumped a sealed safe into the lake. The search for it and the 6 million gold marks it is said to contain has as yet not been successful.〔〔http://www.montyhalls.co.uk/tv-series/montys-diving-mysteries-1〕
Tilapia guinasana, a mouth-breeding species of fish which naturally was only found in Otjikoto's sister lake, Lake Guinas, was introduced to Otjikoto Lake.〔 The IUCN Red List of Threatened Species: Tilapia guinasana〕 The claim that Lake Guinas is connected to Lake Otjikoto by underground caves is frequently made but not proven as yet.〔
==References==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
■ウィキペディアで「Otjikoto Lake」の詳細全文を読む
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