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Slieve Gallion , is a mountain in County Londonderry, Northern Irelandmarker. By road, it is from Moneymoremarker, from Cookstownmarker, and from Magherafeltmarker. It is the eastern limit of the Sperrin Mountains range. It has 2 peaks: the southwestern peak at Glenarudda Mountain and Tintagh Mountain reaches a height of , and is the 397th highest peak in Irelandmarker; the northeastern peak reaches a height of , and is the 469th highest peak in Ireland; it is also the furthest-east mountain-top in the Sperrins. The southwestern peak is in Cookstown District, and the northeastern peak is in Magherafelt District. The mountain is part of the parish's of Desertmartinmarker, Lissan and Ballinascreenmarker.


Slieve Gallion is a volcanic plug. The mountain is formed from volcanic-derived igneous rock, and also granite on the southern slopes. It is steep, and has a flat top. There is a telecommunications mast on the northeastern summit. To the west, the landscape consists of blanket bog and coniferous forest; most of the trees in the Slieve Gallion area are Sitka spruce. There are also lodgepole pine trees, as well as oak towards the south of the area. Animal species living in the area include the Irish hare (a sub-species of the mountain hare), the curlew, and the red grouse. The otter can also be found around nearby rivers. Slieve Gallion is classed by the Northern Ireland Planning Service as an area of "High Scenic Value".


Peat formed at Slieve Gallion in the early Holocene period, around 10,000 years ago. The radiocarbon dating of pollen has shown that there were plants in the area 10,000 years ago. 7,000 ago, the number of alder trees steeply increased. In recent decades, there has been an increase in the number of sheep grazing in the area, as well as an increase in mountain biking, contributing to erosion.


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