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You mention "oceans", certainly we have huge aquifers in the world (Ogallala in the US is a big one; 174,000 square miles, bigger than the Caspian Sea (at 143,000 sq mi). Here are other aquifers). ...
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You mention "oceans", certainly we have huge aquifers in the world (Ogallala in the US is a big one; 174,000 square miles, bigger than the Caspian Sea (at 143,000 sq mi). Here are other aquifers). ...