Otjikoto Lake is a sinkhole lake, created by a collapsing karst cave near Tsumeb, Namibia. In June 1915 German troops dumped war materials in the lake…

Otjikoto Lake is a sinkhole lake, created by a collapsing karst cave near Tsumeb, Namibia. In June 1915 German troops dumped war materials in the lake…
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