Hewitts on The Isle of Man
A Mountain in England, Ireland and Wales is defined as being any high point over 610m (2000ft) above mean sea-level with at least 30m (approx 100ft) of 'prominence' or 'ascent' on all sides.
English, Irish and Welsh mountains are also sometimes known by the acronym Hewitt which stands for Hill in England, Wales or Ireland over Two Thousand feet.
Since the definition of a Hewitt only includes tops in England, Ireland and Wales there aren't any Hewitts on the Isle of Man. However, Sneafell at 621m (2,038ft) would qualify as a Manx Mountain (or Hewitt) in terms of height and prominence.
Mountains in Scotland using the same criteria (i.e. over 610m (2,000ft) & 30m of 'prominence') are commonly known as Munro Tops, Corbett Tops and Graham Tops.