Mona Incha is situated on what was once an island in the now-drained Lough Cre. The twelfth-century church has a finely decorated Romanesque doorway and chancel arch. The head of the high cross dates from the twelfth-century, although the base is from the ninth-century.

Giraldus Cambrensis wrote of the island in the thirteenth century that “no woman can land on it without dropping down dead as soon as she touches the shore; and the same thing happens to the female of any of the lower animals. This has often been proved: for the females of dogs, cats, and other animals have been brought over to make trial: and they have always died the moment they reached the island”