Set amidst the broad sweep of the Sperrin foothills, the Murrins had their origins in the late glacial period.
A retreating ice sheet dammed a lake into which rivers brought vast quantities of sediment. The sedement was then deposited in a series of deltas.
Today, this dry raised fan of material supports a rich heath vegetation dominated by bell heather which is home to the red grouse. Its dry ridges extend out like a delta into a sea of blanket bog, itself only some 4000 years old.
Turf-cutters here have unearthed the remains of a bronze-age field network under the bog, established at a time when the climate was different and the growing qualities of soil quickly became exhausted.
Perched among the glacial moraines (rocky debris or till carried along and deposited by a glacier) are several small lakes called kettle-holes, formed from melted blocks of ice abandoned by the retreating ice-sheet. They are the haunt of mallard, teal and the occasional nesting feral grey-lag goose.
Around some of the lakes, green and blue damselflies dart amongst the swampy vegetation which includes the rare broad-leaved mud sedge. This is a place of open vistas, expansive bogland and the ever-present whistling wind, a fitting place for hunting falcons.