County Cavan rich in minerals, but heavy and poorly drained, making pasture farming the dominant farming system in the county. There is a total farmed area of in the county, and there are approximately 219,568 cattle in Cavan. Lakeland Dairies Group, which is based in Killeshandra and has manufacturing sites located throughout Cavan, is Ireland's second largest dairy co-operative with an annual revenue of €545 million. Cavan is one of Ireland's leading counties for pig production, with the county's farms raising a fifth of the national pig herd. Pig farming regulations have put pressure on the industry, which is highly dependent on
County Cavan springs near Bailieborough; the River Annalee which flows from Lough Sillan and joins the Erne; and the Cladagh river which rises from Cuilcagh and flows into Fermanagh. The Glyde and the Owenroe also source in Cavan. Cavan is known as 'The Lakeland County' and is reputed to contain 365 lakes. At , Lough Sheelin is the county's largest lake; it is situated in the south of the county and forms a three way border on its waters between counties Meath, Westmeath and Cavan. A large complex of lakes form in the north and west of Cavan into designated Specially Protected