A former reservoir in the centre of the Isle of Bute in Argyll and Bute, Kirk Dam represents a northeastern extension of Loch Fad, from which it is separated by a causeway. The reservoir was created as part of Robert Thom's scheme to power the cotton mills of Rothesay, lying just a half-mile (1 km) to the north northeast. Now much overgrown with reeds and bulrushes, Kirk Dam provides an important habitat for wintering wildfowl and marshland species such as Reed Bunting, Sedge Warbler and Grasshopper Warbler. There is a bird hide on its southwestern shore. The ruins of St Mary's Chapel lie next to the High Kirk on the slopes above its northeastern shore.