Monaincha Abbey is situated on what used to be an island in a bog. The principal remains are of a church with Romanesque features and later Gothic insertions and additions.
The nave and chancel have a finely decorated 12th-century west doorway and chancel arch constructed in a warm sandstone. The entrance to the nave is through a decorated Romanesque doorway with chevron design and scroll work and roll decoration. The monastery experienced a revival in the 12th century when it became Augustinian.