The southern end flows in through the Bona narrows from Loch Ness.

The northern end flows out through the Caledonian Canal and the River Ness towards the Beauly and Moray Firths to the North Sea.

The building of the Dochgarroch weir by Thomas Telford between 1825 and 1830 raised the water level of the river upstream by almost two metres, flooded the riverside back to Loch Ness, and created Loch Dochfour.

[2][3] The A82 road runs adjacent to and in part over Loch Dochfour.

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