Slieve Binnian

The Binnian Tunnel (2.5 miles long) was constructed between 1947 and 1950/51 and is located under the Mourne Mountains in County Down, Northern Ireland. The main purpose of the tunnel is to divert water from the Annalong Valley to the Silent Valley Reservoir underneath Slieve Binnian, after which the tunnel was named. A workforce of 150 was involved in two tunnelling teams which started from opposite ends and met in the middle nearly 800m under the roof of the mountain. When the two teams met in the middle on 6 December 1950, they were only inches out. The tunnel was created using drilling and blasting techniques. The shelters for the workers can be found on Slievenaglogh. The tunnel was designed to carry 90 million imperial gallons (410,000 m3) of water per day, be 2.5 miles (4.0 km) long, 7 feet (2.1 m) high and 8 feet (2.4 m) wide. The tunnel was officially opened in August 1952.

The Silent Valley Reservoir is a reservoir located in the Mourne Mountains near Kilkeel, County Down in Northern Ireland. It supplies most of the water for County Down, surrounding counties and most of Belfast. It is owned and maintained by Northern Ireland Water Limited (formerly DRD Water Service). The reservoir was built between 1923 and 1933 by a workforce of over 1,000 men, nine of whom died during construction.

The Mourne Wall (Irish: Balla an Mhúrn) was constructed to enclose a catchment area of the Silent Valley Reservoir in the Mourne Mountains, Northern Ireland. 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). The project was overseen by the Belfast City and District Water Commissioners.

Ben Crom Reservoir is a reservoir located in the Mourne Mountains near Kilkeel, County Down, Northern Ireland. Along with Silent Valley Reservoir, which is situated further down the Kilkeel River valley, it supplies water for County Down, surrounding counties and most of Belfast. It was constructed between 1953 and 1957, as the final part of the Mourne scheme to provide water to Belfast which started with the passing of the Belfast Water Act in 1893.Ben Crom is a mass gravity dam, meaning it is made of concrete and designed so that the dam's own weight stabilises it against the force of the water. The middle of the structure consists of mass concrete with granite plumbs weighing up to 5 tonnes. The outer face of the dam was made with precast concrete blocks. The project cost approximately £1 million to build and employed 186 people.In 2012 Northern Ireland Water carried out refurbishments at Ben Crom as part of a £1.6 million scheme to maintain and improve a number of reservoirs in Northern Ireland.

Ben Crom (from Irish Binn Chrom, meaning 'curved/stooped peak') is a 526 metres (1,726 ft) mountain in the Mourne Mountains in County Down, Northern Ireland. It is situated beside Ben Crom Reservoir, which is upstream from Silent Valley Reservoir. The mountain is composed of granite. An exposed area on the south west of the mountain shows where the Eocene aplitic granite meets the laccolith top of the older Mesozoic granite ring dike. The summit of the mountain features granite crags which are crossed by basic and feldspar porphyry dikes. The mountain is used for sheep grazing and hill walking.

Slieve Lamagan or Slievelamagan (from Irish Sliabh Lámhagáin, meaning 'mountain of crawling/creeping') is one of the Mourne Mountains in County Down, Northern Ireland. It has a height of 702.2 metres (2,304 ft). Slieve Lamagan stands in the middle of the high Eastern Mournes, overlooking Ben Crom Reservoir to the west, Annalong River valley to the east, and Cove Mountain to the northeast. At its southern foot is a small lake called Blue Lough, and a rock formation known as 'Percy Bysshe' .It is said that the mountain was named Sliabh Lámhagáin, "mountain of crawling/creeping", because its steepness meant it had to be climbed in a crawling position. An older name was Slieve Snavan, from Sliabh Snámháin, which has the same meaning.

Mourne (named after the Múrna) is a barony in County Down, Northern Ireland. It lies in the south-east of the county, with the Irish Sea to its east. It is bordered by two other baronies: Iveagh Upper, Lower Half and Iveagh Upper, Upper Half to the north and west. Called at one time Bairrche its present name of Mourne comes from the Múrna (Old Irish: Mughdorna), a people who hail from a territory of the same name in modern County Monaghan.

Annalong Forest is located near the village of Annalong in County Down, Northern Ireland. It is made up of two sections: Annalong Wood and Silent Valley. The forest consists of various species of conifer. It is part of the Mourne Area of Outstanding Natural Beauty. There have been two major forest fires in the area since 2011. One, which started on 30 April 2011, required 10 fire engines to extinguish and caused the temporary closure of several roads. Another, on 24 April 2010, destroyed approximately 50 hectares of gorse and was believed to have been started deliberately.

Slieve Bearnagh (from Irish Sliabh Bearnach 'gapped mountain') is one of the Mourne Mountains in County Down, Northern Ireland. It has a height of 739 metres (2,425 ft). Its summit is crowned by two tors with a gap between them, giving it a distinctive shape. The Mourne Wall crosses the summit of Slieve Bearnagh east to west. Paths lead to the cols on either side of the mountain, namely Pollaphuca ("pool of the púca") to the west and Hare's Gap to the east. From the latter, one can also descend southwards to the head of the Ben Crom reservoir.

Slieve Meelbeg is a mountain located in the Mourne Mountains. It is a popular hiking destination and is 5.5 miles (8.9 km) east of the village of Hilltown.

Slieve Beg (SLEEV BEG; from Irish Sliabh Beag, meaning 'little mountain') is one of the Mourne Mountains in County Down, Northern Ireland. It has a height of 595.9 metres (1,955 ft).

Slieve Meelmore is a mountain in the Mourne Mountains. It is a popular hiking destination and is just under six miles (9.7 km) east of the village of Hilltown. The mountain stands at a height of 680 m (2230 ft) and is the seventh-highest mountain in Northern Ireland. It is in the West Mournes with Slieve Meelbeg to the south and Slieve Bearnagh to the east. The Mourne Wall passes over its summit.