The Deweys are mountains or hills in England, Wales or the Isle of Man that exceed 500 metres in height but are below 610 metres (2,000 feet) in altitude. It must be separated from adjacent tops by a height difference of at least 30 metres on all sides. The definition is similar to the Hewitts and Sims except that Hewitts must be above 2,000 feet and Sims above 600 metres.
The Deweys are named after the lists compiler Michael Dewey the list appearing as one of the chapters in his book Mountain Tables.
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