Mer City is a city located in the sea and inhabited by Mermaids. The A-B-Sea Serpent and the Rattlesnake live in Mer City, where the Serpent teaches the Mer children their letters, and the Rattlesnake keeps the Mer babies amused when the Mermaids are out shopping. When they went on vacation in the Emerald City, they talked incessantly of the Mer City. (The Royal Book of Oz)

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