Ben Oss

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Ben Oss
Ben Oss 2.jpg
Ben Oss seen from north of Tyndrum
Range: Tyndrum Hills
Summit: 3,376 feet NN287253

Ben Oss is a mountain in Perthshire, which reaches a height of 3,376 feet at its summit. It is amongst the Tyndrum Hills.

The name 'Ben Oss' is form the Gaelic Beinn Ois (peɲˈɔʃ), most usually translated as "Mountain of the elk". It is four miles southwest of the village of Tyndrum within the Loch Lomond and the Trossachs National Park.


Ben Oss reaches a height of 3,376 feet and so qualifies as a Munro. It stands in a group of hills in the Cononish valley to the west of Tyndrum which consists of three other Munros - Ben Lui, Beinn Dubhchraig and Beinn a' Chleibh - and the "Corbett" Beinn Chùirn. When viewed from the north or south it is seen as a distinct pointed hill in contrast to its more bulky neighbour Beinn Dubhchraig, with which it is usually climbed.

The mountain is quite rocky and craggy being composed of mica schist rock.[1] The hills name has two possible meanings in the Gaelic with guide books being divided on the subject. “Os” can mean an elk or a loch outlet, with a lochan and a stream with the same name in the immediate vicinity it implies that the area around Ben Oss was where elk were found before they were hunted to extinction.[2]


The summit of Ben Oss from its southwest ridge
Ben Oss summit cairn with Ben Lui behind

Ben Oss is especially craggy on its northern face, falling away steeply to the Cononish valley and barring any direct approach from this direction. It has two main ridges which connect to the adjacent Munros of Ben Lui and Beinn Dubhchraig and walkers usually arrive at the mountains summit along either of these. One ridge goes north east, east and then south east to form a curving edge around Coire Garbh connecting to Beinn Dubhchraig at the Bealach Buidhe pass with a height of 2,556 feet. Coire Garbh has Loch Oss lying within its recesses, a body of water measuring roughly 550 yards by 350 yards. Coire Buidhe stands on the northern side of this eastern ridge, this has a steep headwall and descents north from the bealach to the Cononish valley are not recommended.[3]

Ben Oss’s other ridge goes south west to a col at the head of Coire Laoigh with a height of 687 metres which links to Ben Lui. Ben Oss’ southern slopes drop less steeply to Glen Falloch and the land at the head of Loch Lomond. Ben Oss lies on the drainage divide between east and west; rainfall that falls on the northern slopes drains to the Cononish valley which forms the headwaters of the River Tay and eventually goes to the east coast, while drainage from the southern slopes goes by way of Glen Falloch and Loch Lomond to reach the sea at the west coast at the Firth of Clyde.

Ben Oss alongside Ben Lui stand at the head of Glen Fyne, a contuation of the sea loch, Loch Fyne at 40 miles long in Argyllshire.


Because of a lack of good access paths from the south (Glen Falloch), Ben Oss is usually climbed from the area just south of Tyndrum, with the usual start being at Dalrigh (grid reference NN343292) on the A82 road. Many guide books recommend climbing Ben Oss with Beinn Dubhchraig from Dalrigh and this allows for a less steep approach over Dubhchraig and then continuing to Ben Oss via the Bealach Buidhe. A circular walk around the head of the Cononish valley can be continued over Ben Lui and Beinn Chuirn to finish again at Dalrigh.[4] The summit of the mountain is flattish and the medium size cairn stands on an area of large slabby rocks interspersed with grass. The summit has a prominence of 1,122 feet and gives a fine vista of the southern Highlands, it is a good place to admire the craggy eastern face of neighbouring Ben Lui.


  1. "Hamish‘s Mountain Walk" Pages 80 (Gives geology).
  2. "The Magic of the Munros" Pages 15 (Gives details of name translation).
  3. "The Munros" Page 20 (Details steepness of Coire Buidhe).
  4. "The Munros" Page 20 (Gives details of ascents).
Munros in SMC Area SMC Section 1 - Loch Lomond to Loch Tay

An CaistealBeinn a' ChleibhBeinn a' ChroinBeinn BhuidheBeinn ChabhairBeinn DubhchraigBeinn ÌmeBeinn NarnainBeinn TulaicheanBen ChonzieBen LomondBen LuiBen MoreBen OssBen VaneBen Vorlich, Dunb.Ben Vorlich, Perth.Cruach ArdrainStob BinneinStuc a' Chroin