This is a list of mountains in Britain and Ireland by height and by prominence. Height and prominence are the most important metrics for the classifications of mountains by the UIAA; with isolation a distant third criterion. The list is sourced from the Database of British and Irish Hills for peaks that meet the consensus height threshold for a mountain, namely 600 metres ; the list also rules out peaks with a prominence below 30 metres , and thus, the list is therefore precisely a list of the 2,754 Simms in the British Isles . Many classifications of mountains in the British Isles consider a prominence between 30–150 metres as being a top, and not a mountain; however, using the 30 metres prominence threshold gives the broadest possible list of mountains. For a ranking of mountains with a higher prominence threshold use: List of Marilyns in the British Isles, for ranking by height and by prominence, of peaks with prominence over 150 metres ; or List of P600 mountains in the British Isles, for ranking by height and by prominence, of peaks with prominence over 600 metres As of October 2018, 6,414 people had climbed all 282 Scottish Munros, over 270 people had climbed all 1,557 Marilyns of Great Britain, while only 2 people had completed the 2,529 Simms of Great Britain, Ken Whyte and Iain Thow, and no one had yet completed all 2,754 Simms of the British Isles.
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