The Ramtops are the Discworld's principal mountain range. Across their vast extent, from the Hub to the Rim, they incorporate elements from virtually every noted mountain range of Earth, from the Scottish Highlands (Lancre) to the Himalayas (the High Tops) to Appalachia (Slice). They are the Disc's main magical conduit, as they lie like a metal rod across the centre of the Disc's magical field (indeed, the source of the field, the Cori Celesti, is technically part of the Ramtops), and are thus alive with unreality. Portals to various otherworlds dot the range's hidden crevices; gnarly ground compresses vast areas of land into tiny patches, and where witches, wizards, and godlike monks alike practice their arts within these secluded communities.