Originally known as Kilcolmonell, Colmonell is a large and very rural parish which lies in the south of the county, between Ballantrae to the south and Girvan and Barr to its north. The parish includes the villages of Colmonell, Lendalfoot, Ford, Kildonan and Barrhill. The parish is also the site of ruins of Knockdolian, Carleton and Craigneil Castles.
On the coast under Bennane Head, is found a large well-lit cave which is known as Sawney Bean's Cave. It was home to the legendary Bean family whose infamy was to have been cannibals. The legend, told in a number of popular ballads and tales, has it that they preyed on travellers on the road running above the cave.
To the east of the parish is the county boundary with the Stewartry of Kirkcudbright and the Parish of Minigaff.