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A Map of the Chief Plains and Craters of the Moon

A Map of the Chief Plains and Craters of the Moon.jpg A Mammoth Drawn on the Wall of the Font-de-Gaume CavernThumbnailsAn Eight-Armed Cuttlefish or Octopus Attacking a Small CrabA Mammoth Drawn on the Wall of the Font-de-Gaume CavernThumbnailsAn Eight-Armed Cuttlefish or Octopus Attacking a Small CrabA Mammoth Drawn on the Wall of the Font-de-Gaume CavernThumbnailsAn Eight-Armed Cuttlefish or Octopus Attacking a Small CrabA Mammoth Drawn on the Wall of the Font-de-Gaume CavernThumbnailsAn Eight-Armed Cuttlefish or Octopus Attacking a Small CrabA Mammoth Drawn on the Wall of the Font-de-Gaume CavernThumbnailsAn Eight-Armed Cuttlefish or Octopus Attacking a Small CrabA Mammoth Drawn on the Wall of the Font-de-Gaume CavernThumbnailsAn Eight-Armed Cuttlefish or Octopus Attacking a Small CrabA Mammoth Drawn on the Wall of the Font-de-Gaume CavernThumbnailsAn Eight-Armed Cuttlefish or Octopus Attacking a Small Crab

The plains were originally supposed to be seas: hence the name "Mare."