The Allt Graad (Scottish Gaelic: Allt Grànnda: Ugly Stream) or River Glass is a river in Easter Ross, Highland, Scotland.
It is named on Ordnance Survey maps variously as Allt Graad and River Glass.
This run-of-the-river scheme is on the lower catchment of the river, next to the Black Rock Gorge.
Between Glen Glass and Evanton it flows through the Black Rock Gorge, associated in local tradition with the Lady of Balconie.
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