The Caribbean island country of Grenada is divided into regions known as parishes.
A parish defines a territorial unit or region that, historically, was usually an area under the pastoral care served by a local church as an ecclesiastical administrative unit (see Parish) and later used by map-makers to set boundaries to an area of land. Traditionally a settlement or village would centre on a church and later grow to become a town and then even a city. Therefore a parish has now come to mean an administrative division and is used so by several countries as the smallest unit (or lowest tier) of local government.
The differing size and shape of each parish was primarily influenced by the island's earlier history and land that was granted to the first settlers that claimed that territory during the colonial years of the island.
More information on the Wikipedia page [1]