Ben Crom Reservoir

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.

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 Binnian (from Irish Sliabh Binneáin, meaning 'mountain of the little peaks') is one of the Mourne Mountains in County Down, Northern Ireland, 9 km north of Kilkeel. It is the third-highest mountain in Northern Ireland at 747 metres (2,451 ft). The summit is broad and flat with rocky tors at the north and south ends, with the Back Castles, impressive towers of granite, in between. To the south-west is Wee Binnian (from Irish Broinn Bhinneáin, meaning 'breast of Binneán') (460m). It lies east of Silent Valley Reservoir and west of the Annalong Valley. The Mourne Wall also crosses over Slieve Binnian.The mountain is in the townland of Brackenagh East Upper (379 acres), the civil parish of Kilkeel and the historic barony of Mourne.

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.

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.

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 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.

Slieve Corragh (SLEEV KORRA; from Irish Sliabh Corrach, meaning '"rugged/pointed mountain" or "sheep hill"') is one of the Mourne Mountains in County Down, Northern Ireland. It has a height of 640 metres (2,100 ft).

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).

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.

Slieve Commedagh (from Irish Sliabh Coimhéadach, meaning 'the guarding/watching mountain') is a mountain with a height of 767 m (2,516 ft) in County Down, Northern Ireland. It is the second-highest of the Mourne Mountains, after Slieve Donard, and the second-highest mountain in Northern Ireland. Slieve Commedagh lies to the northwest of Slieve Donard, and the two are linked by a col. The Mourne Wall passes east–west over the mountaintop, and there is a small one-room tower at the summit. There is also the remains of an ancient burial cairn on the summit. On its southern side is a group of granite tors known as 'the Castles'.The Slieve Commedagh massif also includes the summits of Slievecorragh (to the east), Shan Slieve, Slievenamaddy and Slievenabrock (to the north).