The largest Northern Hemisphere iceberg on record was encountered near Baffin Island in 1882. It was 13 km long, 6 km wide and had a freeboard (height above water) of about 20 m. The mass of that iceberg was in excess of 9 billion tonnes - enough water for everyone, in the world to drink a litre a day for over 4 years. Despite this staggering statistic, icebergs from Antarctica may be many times larger than this. In 1987 an iceberg with an area of 6350 square kilometers broke from the Ross ice shelf. That berg had a mass of around 1.4 trillion tonnes and could have supplied everyone in the world with 240 tonnes of pure drinking water.
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