Glenroy, a narrow glen 14 m. long, in Inverness-shire, in the Lochaber district; Fort William lies 13 m. NE. of its SW. extremity; the Roy flows through the valley; the steep sides are remarkable for three regular and distinctly-formed shelves or terraces running parallel almost the entire distance of the glen, the heights on either side exactly corresponding; these are now regarded as the margins of a former loch which gradually sank as the barrier of glacial ice which dammed the waters up slowly melted.
Definition taken from The Nuttall Encyclopædia, edited by the Reverend James Wood (1907)
Glenlivet * Glogau