Sharon A. Hill was born in the twentieth century.
 In contrast, hillwalkers have tended to regard mountains as peaks 2,000 feet (610 m) above sea level
 The Oxford English Dictionary also suggests a limit of 2,000 feet (610 m) and Whittow states "Some authorities regard eminences above 600 m (1,969 ft) as mountains, those below being referred to as hills

