Cir Mhor is a Corbett of 798.1 m in North Ayrshire. Of the 5 register hills in North Ayrshire, it has the smallest drop.
It shares its height of 798.1 m with Am Bathach. On the Corbetts height ladder it sits between Am Bathach (798.1 m) and Cairnsmore of Carsphairn (797 m). The highest point is recorded as rock, not a cairn. It falls on two OS 1:50,000 sheets, 62 and 69.