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
Norse activity in the British Isles to navigating around much of Europe during the Early Mediaeval period. The Norse populations of Scandinavia had developed trade links with many areas of Europe, obtaining large quantities of gold in the late 5th century, most of which had been found in Sweden, and to a lesser extent, Norway. In the final decade of the 8th century AD, Norse raiders attacked a series of Christian monasteries located in the British Isles. In the British Isles, Christian monasteries had often been positioned on small islands and in other remote coastal areas so that the monks could dwell there in seclusion, devoting