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  • Areas below sea level can allow pumping costs to be zero.
  • Huge amounts of sea water must be moved into hot arid areas to evaporate at 2 meters per annum to provide the net cooling effects needed.
  • The Qattara Depression needs the constant flow from a tunnel of more than 15 m (50 feet) in diameter, 55 km long and dropping 60 m to match the evaporation of the 12,000 km² lake formed.




North America


  • Lake Eyre, Australia, −16 m (−52 ft), lowest land in Australia
  • Lake Frome, Australia, −6 m (−20 ft)
  • Taieri Plain, New Zealand, −2 m (−7 ft)

South America

Information courtesy of Wikipedia.com

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