Strathglass is a strath or wide and shallow valley in the Northwest Highlands of Scotland down which runs the meandering River Glass from the point at which it starts at the confluence of the River Affric and Abhainn Deabhag to the point where, on joining with the River Farrar at Struy, the combined waters become the River Beauly.
The A831 road runs southwest from the vicinity of Erchless Castle up the length of Strathglass and serves the village of Cannich which is the largest settlement within the valley. The road then runs east from here via Glen Urquhart to Drumnadrochit beside Loch Ness. A minor road continues southwest up the valley from Cannich towards Glen Affric. Strathglass was also followed by a line of electricity pylons but that has been replaced by a line of new pylons across Eskdale Moor to the east of the strath. Both flanks of the valley are heavily wooded; on the higher ground to the northwest, beyond the forests are the moors of Struy Forest and Balmore Forest.
Strathglass has been carved out by water and glacial action along the line of the Strathglass Fault through Loch Eil Group psammites of the Moine Supergroup. The northeast-southwest aligned fault is a Caledonoid tectonic feature. The floor of the valley is formed from alluvium deposited by the river, backed by remnant river terraces in places.
- Ordnance Survey 1:25,000 scale Explorer map sheet 431 Glen Urquhart and Strathglass
- http://www.largeimages.bgs.ac.uk/iip/mapsportal.html?id=1002467 BGS 1:50,000 sheet Scotland sheet 83W Strathconon Solid & Drift Geology