The meridian 81° west of Greenwich is a line of longitude that extends from the North Pole across the Arctic Ocean, North America, the Atlantic Ocean, the Caribbean Sea, Central America, the Pacific Ocean, South America, the Southern Ocean, and Antarctica to the South Pole.
The 81st meridian west forms a great circle with the 99th meridian east.
Starting at the North Pole and heading south to the South Pole, the 81st meridian west passes through:
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