A view towards the east end of the loch from Stacan Dubha.
|Location||Ullapool, Ross and Cromarty, Scotland|
|Primary outflows||River Ullapool|
|Max. length||3 km (1.9 mi)|
|Surface area||3.36 km2 (1.30 sq mi)|
|Average depth||8.4 m (27.7 ft)|
|Max. depth||21 m (70 ft)|
|Water volume||11.4 km3 (2.7 cu mi)|
|Surface elevation||80 m (260 ft)|
Loch Achall is a long narrow loch, 579 m (1,900 ft) at its widest point. It is dominated by the peaks of the Marilyn's Beinn Eilideach directly to the south, at 559 m (1,833 ft) and the peak of Meall Liath Choire to the north east at 549 m (1,801 ft). The loch is fed by the Rivers Rhidorroch and Allt a'Ghiubhais, while the River Ullapool flows from its western end towards Loch Broom.
- Munro, David; Gittings, Bruce. "Achall, Loch". The Gazetteer for Scotland. School of GeoSciences, University of Edinburgh and The Royal Scottish Geographical Society. Retrieved 14 September 2018.