The Lugton Water, the largest tributary of the River Garnock, runs 14 miles (23 km) from Loch Libo (395 feet above sea-level) in Uplawmoor, through Lugton and the parishes of Neilston, Beith, Dunlop, Stewarton and Kilwinning.

The Lugton joins the Garnock below the tidal limit, shortly after passing through Eglinton Country Park, developed around the ancient estate of the Earl of Eglinton.

[2] The course through Eglinton Park has been greatly through the construction of several weirs, canalisation, 'loops' infilled, small lochs removed, etc.

The Duniflat Burn joins the Lugton Water from the East Ayrshire side close to the North Biggart bridge near where the Bells Burn from Bells Bog on the East Renfrewshire side also has its confluence.

The Bungle Burn, an outflow of the Blae Loch, joins the Lugton Water near the Bungleburn Bridge outside the village of Burnhouse.