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
History of the British Isles one point. The history of the formation of the United Kingdom is very complex. The British monarch was head of state of all of the countries of the British Isles from the Union of the Crowns in 1603 until the enactment of the Republic of Ireland Act in 1949, although the term "British Isles" was not used in 1603. Additionally, since the independence of most of Ireland, historians of the region often avoid the term "British Isles" due to the complexity of relations between the peoples of the archipelago (see: "Terminology of the British Isles"). The Palaeolithic and Mesolithic, also