Height : 747m
Grid Ref : J320233
Slieve Binnian (from the Irish: Sliabh Binneáin) 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.
Slieve Binnian Summit Video