Fromleft(“west”) +‎pond(“Atlantic Ocean”) +‎-ia. Apparently from the Usenet newsgroupalt.usage.english circa 1997.[1]

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Leftpondia

1. (slang)English-speakingparts ofThe Americas.
   • 2002 June 17, Graybags <gbas@lineone.net>, “Some Thoughts OnLeftpondia”, inalt.possessive.its.has.no.apostrophe (Usenet):
   • 2003 October 30, tomcatpolka@yaNOSPAMhoo.com, “to Rightpondia”, inalt.usage.english (Usenet):

     One difference between Rightpondia andLeftpondia is that Arpudlians go 'to hospital' and Elpudlians go 'to the hospital'.

   • 2007 August 16, K_S_ONeill@yahoo.com, “RegardingLeftpondia”, inalt.fan.cecil-adams (Usenet):

• Leftpondian

• Rightpondia

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