Lough Derravaragh is situated four miles south of Castlepollard.
It is a large Limestone Lough of about 2,768 acres in area. The lake has been designed to act as a reservoir to the river Inny in that the lake fills up during the winter faster than it drains out, which in turn helps prevent flooding. Today the lake is as well known for its pike angling as it was for its trout.
Pike angling has been the main attraction to the lake over the past ten years and holds a very impressive record of sizeable pike. It has been a venue for many competitions. The lake also holds a good stock of coarse fish which include roach, bream, bream hybrids and tench. The lake is best fished from a boat and access is very good with public access available at a few points i.e. Donore – near Multyfarnham, at Coolure, which is to the right of the Castlepollard – Mullingar Road, and at Faughalstown and Clintons at Gartlanstown, Crookedwood.
The lake itself is a beauty spot attraction with many passing visitors stopping off at Crookedwood to admire the view where the lake forms an inlet between two steep hills.