Slieve Binnian

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Slieve Binnian - Sliabh Binneáin
Slieve Binnian with a light dusting of snow
Elevation	747 m (2451 feet)
Location	County Down, Northern Ireland
Range	Mourne Mountains
Prominence	350 m
Topo map	OSNI Landranger 29, OSNI Outdoor Pursuits map Mourne Country
OSI/OSNI grid reference	J320234
Listing	Marilyn, Hewitt

Slieve Binnian (Sliabh Binneáin in Irish) is the third highest mountain in Northern Ireland at 747 metres. The name comes from the rocky tors situated around the top of the mountain. These very rugged crest of rocky tors makes it easy to identify in views around the Mourne Mountains.

To the south west of the mountain is Wee Binnian and to the west is the Silent Valley Reservoir. The Mourne Wall also crosses over Slieve Binnian.

The Binnian Tunnel was built in the late 1940s underneath Slieve Binnian, to transport water from the Annalong Valley to the Silent Valley. It took four years to construct, and two tunnelling teams started from opposite ends and met in the middle. Having been carefully measuring their positions the whole time, they found they were only two inches off course when the two tunnels met.