"Fermanagh, a county of Ireland in Ulster, 43 m. long and 33 broad, containing 694 square miles, bounded N by Donegal and Tyrone, E by Tyrone and Monaghan, S by Cavan and Leitrim; divided into 18 parishes, and sends 2 members to parliament. It contains rich iron ore and coal, and some marble quarries; but is chiefly noted for the breeding of black cattle, and the manufacture of linen. It is navigable throughout, by means of lough Erne, but is so uneven and boggy, as to render it difficult for travelling. Pop.130,399. Capital, Eniskillen."
[From The New London Gazetteer (1826)]
The Irish Ancestors website (subscription) has the following types of records: State Registration of Births, Marriages & Deaths, Census returns, Land records, Church records, Genealogical Office records, Gravestone inscriptions, Directories, Newspapers, Wills, Deeds, and Occupations.
The Fianna website's pages for County Fermanagh provide important addresses and extensive information about online and other genealogy resources.
Roots Ireland (subscription) "offers access to a unique database of more than 20 million Irish records". Its Fermanagh coverage includes Baptismal/Birth Records, Marriage Records, Burial/Death Records, Census Records and Griffith's Valuation (Free Access).