A cashel is a ringfort built from stone rather than earth and timber, the term distinguishing it from the more familiar raised earthen raths that pepper the Irish countryside. These enclosures, typically circular and dating from the early medieval period roughly between the fifth and twelfth centuries, served as farmsteads and status symbols for farming families and minor lords. The stone construction of a cashel suggests either that the builder had access to good local stone, or sufficient resources to use it, and in the limestone-rich karst country of County Clare, the geology made such choices almost natural.

Maghera sits in a part of Clare where the underlying rock shapes everything, from field boundaries to building materials to the very surface underfoot. The Burren's influence reaches into surrounding townlands, and cashels are not uncommon in this broader region, their walls sometimes remarkably intact after centuries of exposure. The specific history of this particular enclosure, its builder, the period of its construction, and any finds or features recorded within it, remain to be fully documented in the public record.