The enormous floating berg, called A83, has a total area of 146 sq miles (380 sq km) and is around 490 feet (150 metres) thick.The enormous floating berg, called A83, has a total area of 146 sq miles (380 sq km) and is around 490 feet (150 metres) thick. The enormous floating berg, called A83, has a total area of 146 sq miles (380 sq km) and is around 490 feet (150 metres) thick. Science & tech Articles | Mail Online