Loch Fergus (NS 3932 1823) is a freshwater post-glacial 'Kettle Hole' sometimes recorded as Fergus Loch. It is quite visible and is situated in a low lying area close to the B742 road between the farms and dwellings of Trees, Lochfergus and Bowmanston in the Parish of Ayr, South Ayrshire, Scotland. The loch lies to the north of Martnaham Loch, 4 miles (6.5 km) east southeast of Ayr. It drains to the southwest into the Snipe Loch.