Mourne Wall

The 1.5 m (4 ft 11 in) high stone wall, which was built to keep livestock from contaminating water supplies, took almost twenty years to complete (1904 to 1922).

[2] The Silent Valley Reservoir was built between 1923 and 1933 to hold the water from the catchment area enclosed by the wall.

The main purpose of the Mourne Wall was to isolate the catchment area from cattle and sheep.

[7] In 2013, an event's designated route was recorded by a participant as being 30.51 km (18.96 mi) with a total 2,527 m (8,291 ft) elevation.

[9] A second version follows the perimeter of the rainfall catchment area only, cutting across the dam wall of the Silent Valley reservoir.