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 Insular Celtic group. What languages were spoken in the islands before is unknown, though they are assumed to have been Pre-Indo-European. In 55 and 54 BC, Roman general and future dictator Gaius Julius Caesar launched two separate invasions of the British Isles, though neither resulted in a full Roman occupation of the island. From AD 40 to about AD 410, southern Britain was a part of the Roman Empire, with archaeologists referring to this area as "Roman Britain", and this time span the "Romano-British period" or the "Roman Iron Age". In and around the same time period, Ireland was being