From Bushwalk Australia
A series of adjoining mountains that form a distinct group. For example, the DuCane Range. A range is clearly separated from other mountains, usually by passes or valleys.
A range can also be made up of two or more adjoining sub-ranges, eg Eastern and Western Arthurs. A group of isolated peaks in close proximity, such as the Glasshouse Mountains in QLD, would not usually be considered a range.
Ranges are different to single mountains with a series of peaks, eg Cradle Mountain. Mountains within a range do not always share the same geology.