A Dewey is a hill or mountain in England or Wales over 500 metres (1,640 feet) in altitude, but below 2,000 feet (609.6 metres), with a relative height of at least 30 metres (98 feet). The list was compiled by Michael Dewey and published in his book Mountain Tables.[1]
There have many changes to the original list resulting from remapping and surveying. The current list is available from the Database of British Hills [2].