Lists of mountains and hills in the British Isles in England, 366 in Wales and 11 in the Channel Islands. A Simm is a mountain the British Isles that is over high and has a prominence of at least . The word comes from Six-hundred Metre Mountain. There are currently 2,754 recorded Simms in the British Isles, including 2,188 Scottish Simms, 192 English Simms, 149 Welsh Simms, 1 Isle of Man Simm, and 224 Irish Simms. By definition, all Simms are also TuMPs (see below) and most, if not all, are mountains, depending on whether 600 metres or 2,000 feet (610 m) (e.g. a ), is used as the
Lists of mountains and hills in the British Isles was coined as an ironic contrast to the designation "Munro", which is homophonous with "(Marilyn) Monroe". The Marilyns are one of the most popular lists for peak baggers. The Marilyns were expanded in 2007 by the HuMPs (Hundred and upwards Metre Prominence) which reduces the prominence requirement to . Therefore, all British Isles Marilyns are British Isles HuMPS (but not vice versa). The list was compiled by Mark Jackson from a number of sources and published online in 2010 in "More Relative Hills of Britain". There are 2,986 HuMPs in the British Isles: 2,168 in Scotland, 833 in Ireland, 444