The Blue Mountains Range comprises a range of mountains, plateau escarpments extending off the Great Dividing Range about 4.8 kilometres northwest of Wolgan Gap in a generally southeasterly direction for about 96 kilometres, terminating at Emu Plains.
For about two-thirds of its length it is traversed by the Great Western Highway and the Main Western railway line. Several established towns are situated on its heights, including Katoomba, Blackheath, Mount Victoria, and Springwood. The range forms the watershed between Coxs River to the south and the Grose and Wolgan rivers to the north. The range contains the Explorer Range and the Bell Range.